Best Magnetic Key Holder For Car: 10 Options Compared

#1 · Best Overall

1. TOSICAM 3xN52 Lock Box

• Dimensions: 4"D x 1.8"W x 2.5"H
• Weight: 200 g
• Material: Acrylonitrile Butadiene Styrene (ABS), Aluminum

Best for: Combination-locked two-way mounting.

Why it ranks #1: Three N52 magnets, a resettable four-digit combination with over 10,000 possibilities, and a detachable shackle make it a versatile car-focused option.

A resettable four-digit dial offers more than 10,000 combinations, giving the TOSICAM KEY-BOX a coded-access option for spare-key storage. Its detachable shackle also allows hanging from a doorknob, while three N52 magnets provide a second mounting method on flat surfaces such as a vehicle undercarriage.

The combination dial can be reset from its factory setting, so owners can establish their own access code rather than rely on an open case. For placement, the detachable shackle supports hanging, and three N52 magnets support mounting to flat metal surfaces. The waterproof feature and rust-resistant construction are useful for outdoor storage, while the 4-by-1.8-by-2.5-inch dimensions help buyers assess whether their key or other stored item fits.

Skip it if you want a stated IP67 rating and GPS-tracker storage; Family1st's Magnetic Key Box specifies both.

This suits buyers who want coded access and a choice between hanging and magnetic mounting for spare-key storage. Reset the factory code, and check the listed dimensions against the items you plan to store.

Listed on Amazon as: 3xN52 Magnetic Key Lock Box,Magnetic Key Holder,Magnet Key Box for Under car,Hide a key with 10000+ Secure Combinations with Strong Magnet for Storage Indoors, Outside

#2

2. Family1st Magnetic Key Box

• Weight: 3.52 oz
• Material: Plastic, Polycarbonate

Best for: GPS tracker and spare-key carrier.

Why it ranks #2: Its twin magnets have a stated 55-pound pull force, and the polycarbonate shell is listed as IP67 weatherproof for under-car use.

Twin magnets rated at 55 pounds let the Family1st case mount on a clean steel surface beneath a car, truck, trailer, RV, or toolbox. That same enclosure can hold a spare key alongside a GPS tracker, giving buyers a dual-purpose hiding spot without wires or tools for installation.

The 55-pound magnetic hold supports mounting on clean steel, while the IP67 weatherproof polycarbonate shell is specified to resist rain, road spray, mud, and dust. This combination suits under-vehicle placement where both a spare key and a compatible GPS tracker need protection. The stated interior use includes a key fob, house key, or folded cash; the case mounts in seconds without tools or wiring, simplifying setup and later retrieval.

Skip it if you want a resettable combination lock; TOSICAM KEY-BOX offers a four-digit code and detachable shackle.

This is a fit for drivers who want one weatherproof under-vehicle enclosure for a spare key and GPS tracker on clean steel. Keep its small magnets away from children and check tracker dimensions.

Listed on Amazon as: Family1st Magnetic Key Box for Under Car – Hide a Key & GPS Tracker Holder

#3 · Best Included Accessories

3. Domthent Combination Key Box

• Dimensions: 5"D x 3.7"W x 1.7"H
• Weight: 8 oz
• Material: ABS Plastic

Best for: Password-protected outdoor key storage.

Why it ranks #3: Five magnets and a resettable four-digit lock suit vehicle storage; it also includes three waterproof bags, a signal-blocking pouch, and foam padding.

Five strong magnets pair with a resettable four-digit lock in the Domthent key box, combining metal-surface attachment with controlled access for outdoor spare-key storage. Its package listing also includes three waterproof bags, a signal-blocking pouch, and foam padding, giving buyers several supplied storage accessories.

The five-magnet design is specified to attach to a car underside or other metal surface, while the four-digit resettable lock limits access to people with the code. Waterproof and dustproof protection supports outdoor placement, and the 5-by-3.7-by-1.7-inch dimensions provide a useful reference for checking storage space. The included waterproof bags, signal-blocking pouch, and foam padding add options for organizing or protecting items inside the supplied setup.

Skip it if you need a stated magnetic pull force; Family1st's Magnetic Key Box specifies a 55-pound hold.

This fits buyers seeking a combination-locked outdoor box with several included storage accessories. Its 5-by-3.7-inch footprint calls for a broader mounting surface than a compact key holder requires.

Listed on Amazon as: Magnetic Key Box for Under Car, Waterproof Outdoor Magnetic Key Holder with 5 Strong Magnets and Resettable Combination Lock for Vehicle or Home Use

#4

4. BienBion Combination Key Box

• Dimensions: 4.9"D x 3.5"W x 1.7"H
• Weight: 0.26 kg
• Material: Plastic

Best for: Five-magnet coded under-car storage.

Why it ranks #4: This under-car box pairs a resettable four-digit code with five N52 magnets, targeting buyers who want both a lock and multiple magnets.

Five N52 magnets and a resettable four-digit code give the BienBion box both metal-surface mounting and controlled access for an under-car spare key. Its product facts describe attachment on bumpy roads, while the 4.9-by-3.5-by-1.7-inch case provides a defined footprint for choosing a mounting location.

The five N52 magnets are described as holding the box to metal under a vehicle even on bumpy roads, addressing the demands of chassis placement. A resettable four-digit code adds a separate access barrier, and the stated 6.1-cubic-inch capacity helps buyers gauge what may fit. Its anti-rust design and durable plastic construction support outdoor use, while the listed dimensions help assess available clearance beneath a car or truck.

Skip it if you need explicit waterproof protection; TOSICAM KEY-BOX lists waterproof construction and three N52 magnets.

This suits drivers seeking coded under-car storage with multiple N52 magnets and a stated anti-rust design. Buyers who need documented waterproof protection should choose a case that explicitly lists that feature.

Listed on Amazon as: Magnetic Key Box for Under Car, Hide a Key Outside with Combination Lock Box, Resettable Safe Security Code Lockbox with 5 Strong Magnets, Anti-drop Magnetic Holder Under Car, Truck, Outdoor (1,Black)

#5 · Best Simple Waterproof Box

5. TOSICAM MM1 Key Box

• Weight: 0.11 kg
• Material: Polypropylene

Best for: Compact waterproof spare-key storage.

Why it ranks #5: The compact 3.5-by-2-by-1-inch case lists waterproof construction and a removable compartment for drivers who do not need a combination lock.

A removable compartment paired with a waterproof case gives the TOSICAM MM1 a practical way to store a spare key beneath a vehicle or outdoors. Its 3.5-by-2-by-1-inch interior sets a clear capacity boundary, while the portable format supports discreet automotive storage and access when needed.

The removable compartment lets you take the storage section out for loading or retrieving a key, while the waterproof feature supports outdoor placement where the case may encounter wet conditions. Its 3.5-by-2-by-1-inch interior helps buyers judge whether their spare key fits before choosing a hiding spot. Polypropylene construction and a 0.12-liter capacity make this a compact storage option for automotive use, rather than a larger lockbox for bulky items.

Skip it if you need combination access; TOSICAM KEY-BOX adds a resettable four-digit lock and two installation methods.

This suits drivers seeking a compact, waterproof place for a spare key outdoors or under a vehicle. Check the 3.5-by-2-by-1-inch interior against your key before settling on this small-format case.

Listed on Amazon as: Magnetic Key Box, Hide A Key Holder, Under Car Magnetic Key Storage, Waterproof Hidden Key Box for Outside, Car Key Hider Magnet for Vehicles Travel (MM1 Regular)

#6

6. Riomhorry Magnetic Key Box

• Weight: 4.8 oz
• Material: Plastic

Best for: Large-key outdoor storage.

Why it ranks #6: Its three strong magnets and weatherproof ABS-plastic case are aimed at car storage, with room described for larger keys.

Three strong magnets give the Riomhorry key box a way to attach beneath a car or to another metal surface, while its large-capacity description targets keys that smaller cases may not suit. The waterproof ABS case is intended to shield stored keys from rain, snow, and mud outdoors.

The three-magnet attachment supports placing a spare key under a vehicle, and the weatherproof feature addresses exposure to rain, snow, and mud. ABS plastic provides the stated case material, while the product description identifies capacity for large keys and also mentions locator storage. Those features make this a flexible outdoor stash for a spare key or locator; its dimensions are not provided, so the large-key claim cannot be checked against a measured interior.

Skip it if you need a stated magnetic pull rating; Family1st's Magnetic Key Box specifies twin magnets with a 55-pound pull.

Consider this for outdoor spare-key storage when water and mud protection and three-magnet attachment are priorities. Because no interior measurements are listed, buyers with oversized keys should weigh that uncertainty.

Listed on Amazon as: Magnetic Key Holder for Car, Hide a Key Outside Magnetic Key Box, Waterproof Secure Car Key Case with Strong Magnets for under Car, Outdoor Travel, Spare Key Hider for Home

#7 · Best Multi-Case Set

7. RamPro Hide A Key

• Dimensions: 3"L x 1.38"W x 0.25"H
• Weight: 3.2 oz
• Material: Acrylonitrile Butadiene Styrene (ABS)

Best for: Multi-location three-pack storage.

Why it ranks #7: The three-pack offers compact ABS cases with recessed magnets and weather-resistant construction for keeping spare keys in multiple locations.

Three holders in one pack let the RamPro buyer keep emergency spares in multiple places, from a vehicle bumper or tonneau cover to a door frame or mailbox. Each recessed magnet is specified to attach to ferrous metal, steel, or iron, and the slim ABS case measures three inches long.

The recessed magnet holds each case to ferrous metal, steel, or iron, supporting the varied placement examples in the description, including a bumper, rain gutter, mailbox, or refrigerator. A 3-by-1.38-by-0.25-inch profile gives a low-profile format for those storage spots. The ABS plastic is described as waterproof, rust-free, and resistant to corrosion, heat, and impact, which supports use in varied environments while keeping the listed setup tool-free.

Skip it if you need a combination lock; Domthent YG133YSHNEW-1 has a resettable four-digit password lock.

Choose this pack if you want separate low-profile emergency-key holders for several metal locations, including vehicle surfaces. Its quarter-inch height favors compact spares over bulky fobs or additional items.

Listed on Amazon as: RamPro Hide A Key Magnetic Key Holder Under Car – Hide A Key for Your Car So You Never Lock Out – Plastic Magnet Key Hider to Store a Spare for Your Home, Storage, Office, or Vehicle – 3 pack

#8

8. ALAZCO Magnetic Key Holder

• Weight: 0.16 kg
• Material: Acrylonitrile Butadiene Styrene

Best for: Two-case multi-location storage.

Why it ranks #8: The listing describes a large ABS case with a premium magnet for vehicle use, though it provides fewer car-specific details than higher-ranked boxes.

This ALAZCO listing supplies two magnetic key holders, letting buyers keep separate spares at different locations such as a vehicle, home, shed, RV, boat, or office. Each compact ABS case measures four by two by 0.63 inches, offering a slim format for small emergency items and keys.

Having two cases supports placing emergency spares in separate locations rather than moving one holder between them. Their 4-by-2-by-0.63-inch dimensions give buyers a concrete way to assess storage space and placement, while ABS construction provides the listed case material. The magnetic, portable format is identified for vehicles, home, and office use, and the title also names sheds, RVs, boats, and trucks as storage locations.

Skip it if you require a weatherproof outdoor enclosure; TOSICAM MM1 lists a waterproof case and removable compartment.

This is suited to buyers who want two compact magnetic holders for separate spare-key locations around vehicles, home, or office. Its listed facts do not establish weather protection for exposed outdoor mounting.

Listed on Amazon as: 2 Hide A Key Magnetic Under Car Spare Key Holder So You Never Locked Out of Home Shed RV Boat Truck Office Storage Large ABS Case Key Hider Small Valubles Premium Magnet By ALAZCO

#9

9. Lucky Line Magnetic Key Hider

• Weight: 1 oz
• Material: Plastic

Best for: Large standard-key emergency hiding.

Why it ranks #9: This plastic magnetic hider is described for standard-size keys and emergency storage, but the listing lacks car-specific mounting and weather details.

The Lucky Line 91001 is identified as a large magnetic key hider for standard-size keys, giving emergency spares, cash, or notes a simple concealed storage option. Its plastic construction and magnetic format suit buyers seeking a basic holder rather than a coded lockbox with specified weatherproofing.

The large format is identified for standard-size keys, while the listed uses also include cash or notes for emergency lockout preparation. Its magnetic construction provides the stated means of hiding the case, and plastic is the specified material. The product information does not give case dimensions or a weatherproof rating, so buyers should treat it as a basic magnetic hiding case rather than rely on unlisted outdoor protection or a measured fit for larger fobs.

Skip it if you need a resettable code and explicit outdoor protection; Domthent YG133YSHNEW-1 lists both.

This is for buyers wanting a basic magnetic hiding case for a standard key, cash, or notes in an emergency. With no dimensions or weatherproof rating listed, it is a less specified choice for exposed vehicle mounting.

Listed on Amazon as: Lucky Line Large Magnetic Key Hider Case Holder for Standard Size Keys (91001)

#10

10. Master Lock 207D Key Case

• Dimensions: 4.69"D x 2"W x 1.19"H
• Weight: 2.4 oz
• Material: Plastic

Best for: Indoor and steel-surface key storage.

Why it ranks #10: It stores one or two keys and attaches to steel, but the listing explicitly says it is not intended for use on cars.

A sliding cover with a built-in stop keeps the lid from being dropped or misplaced, making the Master Lock 207D a straightforward option for storing one or two keys. Its recessed magnet attaches to steel surfaces, but the manufacturer explicitly says this case is not intended for use on cars.

The 4-11/16-inch exterior length offers room for one or two keys, including most keys with a fob according to the product description. A recessed magnet holds the plastic case to a steel surface, while the sliding cover's stop helps keep the cover attached during access. Rust-resistant plastic is suited to portable storage, but the stated restriction against car use makes this a better fit for indoor or other non-vehicle steel locations.

Skip it if you need an under-car spare-key case; Family1st's Magnetic Key Box is specified for mounting beneath vehicles.

Choose this for a spare key on an indoor steel surface or another non-car location, especially if a sliding, retained cover matters. Avoid it for hiding a key beneath a vehicle.

Listed on Amazon as: Master Lock Magnetic Key Holder, Key Storage Box to Hide Keys Black 207D