Hook and Eye Lock: Complete Guide to Locking Hook and Eye Hardware for Industrial & Commercial Applications

Whether you call it a hook and eye lock, a locking hook and eye, or an eye and hook lock, this versatile fastening hardware solves the same fundamental challenge across dozens of industries: creating a secure, releasable closure that holds firmly under load yet opens instantly when needed. From cabinet doors and gates to industrial enclosures and marine equipment, hook and eye locks are among the most widely used mechanical fastening solutions in both commercial and industrial settings.

This complete guide from Shenli Ringing — a B2B hardware manufacturer supplying customers in over 78 countries — covers everything procurement managers, product designers, and engineers need to know about lock hook and eye hardware: how the mechanism works, what types are available, which materials and finishes suit which environments, installation guidance, and how to source reliably at competitive factory-direct prices.

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What Is a Hook and Eye Lock?

A hook and eye lock is a two-part mechanical fastening system consisting of a curved hook component and a corresponding eye (loop or ring) component. When the hook engages the eye, the closure is secured. Depending on the design, a locking mechanism — spring tension, a rotating cam, a sliding barrel, or a threaded collar — prevents accidental disengagement under vibration, impact, or applied load.

The Basic Mechanism

The fundamental hook and eye engagement works as follows:

1. The eye (also called the keeper, loop, or strike) is fixed to one surface — a door frame, enclosure panel, gate post, or mounting plate
2. The hook is mounted to the moving component — the door, lid, flap, or gate leaf
3. When the hook is rotated or pushed into the eye, mechanical engagement occurs
4. The locking element — spring, cam, collar, or pin — prevents the hook from disengaging without deliberate operator action

This combination of quick engagement and secure locking makes hook and eye locks fundamentally different from simple hook-and-eye sets (which have no locking element and rely purely on gravity or light spring pressure to stay engaged).

How Hook and Eye Locks Differ from Standard Hook and Eye Sets

Standard hook and eye sets — the type used in domestic applications like screen door latches — have no positive locking mechanism. The hook simply rests in the eye and can be dislodged by vibration, wind pressure, or light lateral force.

Hook and eye locks, by contrast, incorporate deliberate locking geometry:

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Types of Hook and Eye Locks: A Complete Classification

Understanding the full spectrum of hook and eye lock types available helps you specify the right solution for your application.

1. Spring-Loaded Hook and Eye Locks

The most common type of locking hook and eye, spring-loaded designs use internal spring tension to keep the hook firmly seated in the eye under normal conditions. Opening requires deliberate pressure against the spring — enough to prevent accidental release from vibration or light contact, but fast and intuitive for operators.

Construction: Zinc alloy, steel, or stainless steel body with an internal compression or torsion spring. The hook rotates on a pivot pin; the spring returns it to the locked position after every engagement.

Load ratings: Typically 20–200 kg depending on size, material, and spring strength.

Best for: Cabinet doors, electrical enclosure latches, light equipment panels, display cases, storage unit closures, vehicle storage compartments, recreational equipment.

Available sizes: Small (hook length 20–30 mm) through large (hook length 60–100 mm) with corresponding eye sizes.

2. Cam-Lock Hook and Eye (Turn-and-Lock)

Cam-lock designs add a rotating cam element to the basic hook geometry. After the hook engages the eye, a quarter-turn or half-turn of the hook body rotates the cam behind the eye keeper, creating a mechanical barrier that prevents withdrawal. Releasing requires rotating the hook in the opposite direction before lifting.

Construction: Typically zinc die-cast or stainless steel with precision-machined cam geometry. Higher-end versions have stainless steel pivot pins and commercial-grade springs.

Load ratings: 50–500 kg depending on size and material.

Best for: Industrial control panels, server rack doors, machine guarding, generator enclosures, transit cases, outdoor equipment cabinets.

Shenli Ringing note: Cam-lock hook and eye is one of our highest-volume B2B products, with demand from electrical enclosure manufacturers, industrial equipment OEMs, and case/transit equipment producers.

3. Draw Latch Hook and Eye (Tension Latch)

Draw latch designs use a hook that pulls the two surfaces together under tension as it engages, creating a clamping force beyond just holding the closure shut. This compression seal capability makes draw latches popular where sealing, vibration resistance, or compression of gaskets is required.

Construction: Die-cast zinc, steel, or stainless steel with a pivoting hook arm that over-centres under tension to lock. Often includes rubber gasket compression for weatherproofing.

Load ratings: 100–800 kg clamping force.

Best for: Industrial transit cases, outdoor equipment enclosures, compressed-air cabinets, weatherproof junction boxes, medical equipment cases, food processing equipment.

4. Hook and Eye Barrel Bolt

This configuration mounts an eye on one panel and uses a sliding barrel bolt (rather than a rotating hook) that passes through the eye to lock. While technically a bolt-through-eye rather than a hook-through-eye, it falls within the eye and hook lock product family and is frequently cross-searched.

Construction: Steel or stainless steel with smooth-sliding barrel mechanism. Flush-mount and surface-mount versions available.

Load ratings: Primarily security application — rated for resistance to forced entry rather than load bearing.

Best for: Gate security, shed doors, storage enclosures, secondary security on access panels.

5. Safety Hook and Eye (Carabiner-Style Locking)

Safety hook and eye hardware is specifically designed for life-safety, fall-arrest, and rigging applications. These devices comply with EN 362, ANSI Z359, or ISO 9001-certified load testing standards and are rated for dynamic and static loads in personal safety applications.

Construction: Forged stainless steel or aluminium alloy with gate closure and positive-locking sleeve (screw-lock, auto-lock, or triple-action lock).

Load ratings: Minimum 15 kN (approximately 1,500 kg) to 40+ kN for heavy rigging.

Best for: Fall arrest systems, rope access, scaffolding, marine rigging, lifting applications, construction safety.

Important note: Safety hook and eye hardware for fall protection applications must be certified to applicable safety standards and should only be used within their certified parameters. Never substitute standard commercial hook and eye locks in life-safety applications.

6. Marine Grade Hook and Eye Locks

Marine-specific hook and eye lock designs prioritise corrosion resistance above all other properties. Salt air, constant moisture, and periodic immersion demand materials and finishes that commercial-grade hardware cannot sustain.

Construction: Marine-grade 316 stainless steel throughout — body, pivot pin, spring, and eye. Plastic or composite versions use UV-stabilised glass-filled nylon for zero-corrosion performance.

Best for: Boat hatches, marine enclosures, sailing rigging, dock hardware, coastal facilities, offshore equipment.

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Materials and Finishes: Matching Hardware to Environment

Material selection for hook and eye locks directly determines service life, maintenance requirements, and suitability for specific environments. This is one of the most consequential decisions in the specification process.

Zinc Die-Cast (Zamak)

Properties: Good dimensional accuracy, smooth surface finish, easy plating adhesion, moderate strength.

Finishes available: Zinc plating, nickel plating, chrome plating, powder coating.

Suitable environments: Indoor, dry, light commercial applications. Not suitable for outdoor or marine use without heavy coating.

Advantages: Low cost, good aesthetic finish, easy to manufacture in complex shapes.

Limitations: Susceptible to corrosion without protective finish; not suitable for high-load structural applications.

Typical applications: Cabinet latches, furniture hardware, light industrial enclosures.

Steel (Carbon Steel)

Properties: High strength, weldable, machinable, cost-effective.

Finishes available: Zinc plating, hot-dip galvanising, powder coating, black oxide.

Suitable environments: Dry indoor environments (zinc plated); protected outdoor (galvanised or powder coated).

Advantages: High load capacity, widely available, good weldability for custom fabrication.

Limitations: Rusts without protective finish; regular maintenance needed in high-humidity environments.

Typical applications: Industrial equipment, gates, heavy-duty enclosures, agricultural applications.

304 Stainless Steel

Properties: Good corrosion resistance, attractive appearance, non-magnetic (most grades), hygienic.

Finishes available: Brushed (satin), polished, bead-blasted.

Suitable environments: Food and beverage, pharmaceutical, general outdoor, light marine exposure.

Advantages: No surface treatment required, maintains appearance over time, hygienic surface.

Limitations: Susceptible to chloride-induced pitting in salt environments; not suitable for direct marine or coastal installation without 316 grade.

Typical applications: Food processing equipment, medical devices, catering equipment, outdoor furniture, commercial kitchens.

316 Stainless Steel (Marine Grade)

Properties: Superior chloride resistance vs. 304, excellent corrosion resistance in salt environments.

Finishes available: Brushed (satin), polished.

Suitable environments: Marine, coastal, saltwater, chemical processing, offshore.

Advantages: Longest service life in aggressive environments; minimal maintenance.

Limitations: Higher cost than 304; slightly less available in non-standard configurations.

Typical applications: Marine hardware, coastal installations, chemical processing, offshore equipment, swimming pool hardware.

Glass-Filled Nylon / Engineering Polymer

Properties: Completely corrosion-proof, lightweight, electrically non-conductive, UV-resistant (stabilised grades).

Finishes: Black (most common), various colours.

Suitable environments: Marine, chemical, electrical, food contact applications.

Advantages: Zero corrosion, chemical resistance, weight saving, no maintenance.

Limitations: Lower structural strength than metal; UV degradation without stabilisation; limited temperature range.

Typical applications: Marine equipment, electrical enclosures where conductivity must be avoided, chemical handling equipment, outdoor furniture.

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Key Technical Specifications to Evaluate

When specifying hook and eye locks for B2B purchasing or product design, these technical parameters determine suitability:

Load Rating

Load rating indicates the maximum force the hook and eye lock assembly can withstand before mechanical failure. Critical parameters:

• Tensile load: Force pulling the hook directly out of the eye (most common failure mode)
• Shear load: Lateral force across the engagement axis
• Peel load: Force applied at an angle, tending to rotate the hook out of the eye
• Cyclic fatigue: Performance over thousands of open/close cycles

Always specify with a safety factor — minimum 3:1 for standard applications, 5:1 or higher for load-bearing or safety-critical applications.

Engagement Geometry

• Hook opening dimension: Must accommodate the eye diameter with installation tolerance
• Eye loop diameter: Must accept the hook with smooth engagement
• Reach depth: How far the hook travels into the eye — affects pull-out resistance
• Clearance angle: The angle through which the hook must travel to disengage

Mounting Configuration

• Surface mount: Fastens to the face of the door/panel — simplest installation
• Flush mount: Recessed into the panel for clean aesthetic — requires machined recess
• Weld-on: Welded directly to metal fabrications — maximum strength
• Through-bolt: Fastens through panel with backing plate — highest pull-out resistance

Environmental Rating

• IP rating (Ingress Protection): IP54 (dust and splash resistant) through IP67/68 (immersion rated)
• Salt spray hours (per ASTM B117 or ISO 9227): 24 hours (basic zinc plate) through 1,000+ hours (316 stainless or quality powder coat)
• Operating temperature range: Standard: -20°C to +80°C; Extended range for industrial applications

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Applications Across Industries

Hook and eye locks appear in a remarkable range of applications. Understanding where they serve real operational needs helps specify the right product for each context.

Industrial Equipment and Machinery

Control panel doors, machine guarding access panels, and electrical enclosure latches all require hardware that operators open frequently but that remains firmly closed during machine operation. The locking hook and eye is the dominant closure choice in this category.

Requirements: CE-compliant if on machinery covered by EU Machinery Directive, appropriate IP rating for environment, quick-release for operator access, tamper-resistance for safety interlocks.

Transportation and Logistics

Truck body panels, trailer access doors, cargo container latches, and vehicle-mounted toolbox closures use heavy-duty hook and eye lock hardware that withstands constant vibration, wide temperature cycling, and outdoor exposure.

Requirements: High load rating for vibration environment, corrosion resistance for road exposure, quick operation for logistics efficiency, compatibility with vehicle mounting standards.

Marine and Offshore

Hatch closures, locker doors, engine compartment access, and rigging hardware demand hardware that performs indefinitely in saltwater environments. Marine-grade eye and hook lock products in 316 stainless steel or glass-filled nylon are specified exclusively.

Requirements: 316 stainless or equivalent; 1,000+ hour salt spray rating; positive-locking mechanism to prevent vibration-induced opening in sea conditions; compliance with relevant marine standards.

Outdoor Storage and Infrastructure

Garden storage buildings, outdoor utility enclosures, telecommunications cabinets, and infrastructure equipment all require weather-resistant closure hardware. UV-stabilised polymer or galvanised/stainless hook and eye locks serve this market.

Requirements: UV resistance, freeze-thaw cycling resistance, adequate IP rating for outdoor installation, ease of operation with gloves.

Food Processing and Pharmaceutical

Hygienic environments require hardware without crevices, with smooth cleanable surfaces, made from materials compatible with sanitising chemicals. 316 stainless steel or food-grade polymer hook and eye locks are specified.

Requirements: Smooth, crevice-free surfaces; 316 stainless or food-contact approved polymer; resistance to cleaning chemicals (chlorine, alkali, acid); no cadmium or lead in surface treatments.

Electrical Enclosures and Switchgear

Panel boards, distribution enclosures, and control cabinets use specialised hook and eye locking hardware that may incorporate key locking (quarter-turn cylinder lock), tool operation (requires screwdriver or special tool to open), or padlock-compatible eyes for lock-out/tag-out (LOTO) compliance.

Requirements: IP rating appropriate to installation environment; compliance with relevant electrical safety standards; lock-out/tag-out compatibility where required.

Consumer and Furniture Hardware

Cabinetry, display cases, jewellery boxes, luggage, and consumer storage products use smaller, aesthetically finished hook and eye locks with an emphasis on appearance alongside function.

Requirements: High aesthetic finish quality, consistent dimension tolerances for production-line assembly, compliance with consumer product safety standards (REACH, RoHS), competitive pricing for volume applications.

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Installation Guide: Getting Maximum Performance

Correct installation is as important as product selection — hook and eye locks installed incorrectly fail prematurely regardless of hardware quality.

Pre-Installation: Alignment Assessment

Before mounting any hardware, confirm:

1. Panel/door alignment: The mating surfaces must close evenly and squarely. Twisted or warped panels prevent proper hook-to-eye alignment and place uneven stress on the latch mechanism.
2. Gap clearance: The gap between door and frame must accommodate the hook’s reach geometry. Too large a gap = insufficient engagement. Too small = binding.
3. Mounting surface condition: Clean, flat, and structurally sound. Hardware mounted to soft or damaged substrates will pull out under load.

Mounting the Eye (Keeper)

The eye should be positioned first, on the fixed frame or panel:

1. Mark the eye position according to the hook’s reach geometry — use the hook as a positioning template
2. Drill pilot holes appropriate to the fastener type (tapping screws, through-bolts, or weld preparation)
3. Mount the eye with appropriate fasteners — through-bolts with backing plates for maximum pull-out resistance; tapping screws for lighter-duty applications
4. Torque fasteners to specification — overtightening distorts the eye; undertightening risks loosening under vibration
5. Check that the eye is square to the panel face — angular misalignment increases wear on the hook engagement surface

Mounting the Hook

1. Position the hook on the moving door or panel so the hook aligns with the eye when the door is closed — allow 1–2 mm clearance for smooth engagement
2. Mark and drill pilot holes
3. Mount with appropriate fasteners
4. Test engagement before final tightening — the hook should enter the eye smoothly with a positive click and release cleanly without binding
5. Final tighten all fasteners

Post-Installation Testing

After installation, verify:

• Full engagement test: Apply force in all directions (pull, push, lateral) to confirm the lock holds without disengaging
• Release test: Confirm the release action is smooth and requires deliberate operation — not so stiff it’s difficult to use, not so loose it releases accidentally
• Cycle test: Open and close 20–30 times to confirm consistent performance
• Vibration check: Where vibration is a concern, check fastener torque after initial use period

Lubrication and Maintenance

Frequency: Light application every 6–12 months in normal environments; monthly in marine or high-cycling applications.

Lubricants by material:

• Steel hardware: Light machine oil or dry PTFE lubricant (oil attracts dust)
• Stainless steel: Silicone lubricant or PTFE — avoid petroleum-based oils that stain
• Polymer hardware: Silicone lubricant only — petroleum lubricants degrade many polymers
• Spring mechanisms: Penetrating oil initially, then PTFE dry film for ongoing lubrication

What to inspect:

• Hook tip wear (rounded tip reduces engagement depth)
• Eye deformation (elongated eye from repeated loading)
• Spring fatigue (reduced closing force)
• Corrosion on carbon steel hardware
• Fastener loosening from vibration

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Shenli Ringing: Your Trusted Hook and Eye Lock Manufacturer

Shenli Ringing manufactures a comprehensive range of hook and eye locks for B2B buyers worldwide — from light-duty cabinet hardware to heavy industrial enclosure latches, from standard zinc die-cast to marine-grade 316 stainless steel.

As a factory-direct manufacturer supplying customers in over 78 countries, we provide genuine quality at competitive prices with the technical support and supply chain reliability that B2B buyers depend on.

Our Hook and Eye Lock Product Range

Series SL-HE100: Spring-Hook and Eye Lock — Light Duty

• Materials: Zinc die-cast body, steel spring; zinc or nickel plated
• Hook sizes: 25 mm, 35 mm, 50 mm
• Load rating: Up to 50 kg tensile
• Mounting: Surface-mount, 2-hole flange
• Best for: Cabinet doors, display cases, light enclosures
• Availability: Stock item — fast delivery

Series SL-HE200: Cam-Lock Hook and Eye — Medium/Heavy Duty

• Materials: Zinc die-cast or steel; zinc, nickel, or powder coat finish
• Hook sizes: 35 mm, 50 mm, 65 mm, 80 mm
• Load rating: Up to 200 kg tensile
• Mounting: Surface-mount or flush-mount
• Best for: Industrial enclosures, control panels, machinery guarding
• Availability: Stock in standard sizes; 10–15 day lead time for non-stock

Series SL-HE300: Draw Latch Hook and Eye — Compression Sealing

• Materials: Zinc die-cast or 304 stainless steel
• Sizes: Small (65 mm), Medium (90 mm), Large (115 mm)
• Load rating: 100–400 kg clamping force
• Features: Compatible with rubber gaskets for weatherproof sealing
• Best for: Outdoor enclosures, transit cases, weatherproof cabinets
• Availability: 10–15 day production

Series SL-HE400: Marine Grade 316 Stainless — Corrosion Proof

• Materials: 316 stainless steel throughout (body, pin, spring)
• Finishes: Brushed satin, mirror polish
• Sizes: 30 mm, 45 mm, 60 mm hook
• Load rating: 50–150 kg (size dependent)
• Best for: Marine, coastal, chemical, food processing
• Availability: Stock in standard sizes

Series SL-HE500: Polymer Hook and Eye Lock — Zero Corrosion

• Materials: Glass-filled UV-stabilised nylon
• Colours: Black standard; custom colours at MOQ
• Sizes: 30 mm, 45 mm hook
• Load rating: Up to 30 kg tensile
• Best for: Electrical enclosures, marine, outdoor furniture, chemical environments
• Availability: Stock item

Custom and OEM Series

• Custom hook lengths, eye dimensions, mounting configurations
• Private label and branding
• Special materials (duplex stainless, aluminium, engineering polymers)
• Custom finishes, colours, and surface treatments
• Contact our engineering team for custom quotation

Quality Assurance

Every Shenli Ringing hook and eye lock is manufactured under ISO 9001:2015 quality management. Our quality programme includes:

• Incoming material inspection: Raw material certificates verified against specification for every batch
• Dimensional inspection: Critical dimensions verified at production using calibrated gauges
• Load testing: Batch destructive testing to confirm rated load values
• Finish quality: Visual inspection and coating thickness testing
• Salt spray testing: Periodic testing per ASTM B117 to verify corrosion performance
• RoHS and REACH compliance: Material declarations provided for all products

Why B2B Buyers Choose Shenli Ringing

Factory-direct pricing removes trading company margins — typically saving 25–40% against distributor pricing while maintaining equivalent or superior quality.

Material transparency: We specify the exact material grade (304 vs 316 stainless, Q235 vs Q345 steel, Zamak 3 vs Zamak 5 die-cast) and provide mill certificates on request. Not “high-quality metal” — specific, verifiable grades.

Flexible minimum orders: Standard items available from 500 pieces. Custom configurations from 1,000 pieces depending on complexity. Sample orders of 10–50 pieces available for product testing and approval.

Fast lead times: Standard catalogue items ship within 10–15 days. Custom tooling and production: 25–35 days for new dies, 15–20 days for subsequent runs.

Comprehensive documentation: Material declarations, test certificates, dimensional drawings, and compliance documentation provided as standard — not on request at extra cost.

Technical support: Engineering team available to assist with specification, custom design, and application engineering. We understand hardware, not just selling it.

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Frequently Asked Questions

Q: What is the difference between a hook and eye and a hook and eye lock? A: A standard hook and eye is a two-piece closure where the hook simply rests in the eye — held by gravity or light spring force. A hook and eye lock incorporates a positive locking mechanism (spring, cam, barrel, or collar) that actively prevents the hook from disengaging without deliberate operator action. Hook and eye locks are suitable for applications requiring security against vibration, wind, pressure, or accidental opening.

Q: What does “locking hook and eye” mean in product searches? A: This search term describes hook and eye hardware with a built-in locking feature — as distinct from standard decorative or domestic hook-and-eye sets. Locking hook and eye products are the industrial and commercial versions with rated load capacities, positive locking geometry, and materials suited to demanding environments.

Q: What material should I specify for outdoor hook and eye locks? A: For general outdoor use: 304 stainless steel or hot-dip galvanised steel. For coastal or marine environments with salt exposure: 316 stainless steel or marine-grade polymer. For environments with aggressive chemicals: 316 stainless or chemical-resistant engineering polymer. Zinc die-cast with zinc plating is not recommended for outdoor applications — the coating degrades within 1–2 years in outdoor exposure.

Q: What load rating do I need for my application? A: Calculate the maximum expected load, then apply a safety factor of at least 3:1 for standard applications (5:1 or higher for safety-critical applications). For example, a closure retaining a 20 kg door against 50 km/h wind pressure (approximately 30 kg force on the latch) requires a hook and eye lock rated for at least 90 kg (30 kg × 3 safety factor). Always consult with our engineering team if load calculation is uncertain.

Q: Can hook and eye locks be used for safety-critical applications like fall arrest? A: Only specifically certified safety hook and eye hardware (meeting EN 362, ANSI Z359, or equivalent standards) should be used in fall-arrest or life-safety applications. Standard commercial hook and eye locks are not designed or certified for these applications regardless of their load rating. Shenli Ringing can advise on appropriate safety-rated hardware for life-safety applications.

Q: What is the minimum order quantity for Shenli Ringing hook and eye locks? A: For standard catalogue items: 500 pieces minimum. Sample orders of 10–50 pieces are available for evaluation before production orders. For custom configurations: 1,000 pieces minimum for standard customisations (colour, finish, minor dimensional changes); 2,000 pieces minimum for new tooling. Contact our sales team for specific MOQ based on your configuration.

Q: Do you offer custom hook and eye locks for OEM applications? A: Yes. Shenli Ringing provides full OEM and custom manufacturing services including custom hook and eye geometry, special materials and finishes, integrated functions (keyed lock cylinder, padlock provision, colour-coded identification), branded packaging, and private label. Our engineering team can develop from customer drawings or work from functional specifications to create a solution.

Q: What certifications do your hook and eye locks carry? A: Our manufacturing facility is ISO 9001:2015 certified. Products comply with RoHS Directive 2011/65/EU and REACH Regulation (EC) 1907/2006. CE marking is applied where applicable under the Machinery Directive or relevant product directives. Specific certifications (material declarations, test reports, dimensional drawings) are available on request for each product series.

Q: How do I prevent hook and eye locks from loosening due to vibration? A: Use through-bolt mounting with locking washers (spring washers or Nordlock washers) rather than self-tapping screws where vibration is a concern. Apply thread-locking compound (Loctite 243 medium strength for removable applications; 271 high strength for permanent) to fastener threads. Select cam-lock or draw-latch designs rather than spring-hook designs for high-vibration environments — the mechanical lock geometry of cam designs is inherently more vibration-resistant than spring closure alone.

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Conclusion: Choosing the Right Hook and Eye Lock for Your Application

Hook and eye locks — whether you know them as locking hook and eye hardware, eye and hook locks, or simply lock hook and eye closures — are indispensable fastening components across an enormous range of industrial, commercial, and marine applications.

The right choice depends on four key parameters working together: the load rating required for your application with appropriate safety factor; the material and finish that survives your installation environment; the mounting configuration that suits your panel construction; and the locking mechanism that provides the security and ease of operation your users need.

Getting these four parameters right produces hardware that performs for years without attention. Getting them wrong means premature failure, maintenance cost, and potentially safety incidents.

Shenli Ringing combines manufacturing expertise across the full range of hook and eye lock types, material transparency that lets you specify with confidence, quality systems that deliver consistency batch to batch, and pricing that reflects factory-direct economics rather than multi-tier distribution markup.