2 Hide A Key Magnetic Under Car Spare Key Holder
4.6Editor score
Includes two premium magnets
Tough ABS weather case
Jumbo size for valuables
In this guide
Finding a secure place to hide spare keys is essential for many drivers and homeowners. A magnetic key box for under car provides a discreet solution that keeps keys accessible yet hidden from prying eyes during emergencies or travel.
We analyzed ten leading products based on magnet strength, durability, weather resistance, and storage capacity. Each model offers unique features designed to protect your keys from theft, weather, and accidental loss while ensuring reliable access when you need them most.
This guide details the strengths and weaknesses of every option to help you choose the right box for your vehicle. Note that product availability and pricing may change over time, so verify current details before making your final purchase decision.
Top 3 Picks for Best Magnetic Key Box for under Car
Magnetic Key Box, Hide A Key Holder
4.6Editor score
Super strong magnetic hold
Waterproof hidden design
Compact 3.5 inch size
Large Magnetic Key Box for Under Car
4.3Editor score
Fits bulky key fobs
Four magnet mounting system
IPX5 weather protection
Top 10 Best Magnetic Key Box for under Car in 2026 Compared
This table provides a side-by-side comparison of all ten products to highlight key differences in size, magnet count, and specific features so you can quickly identify the best match for your needs.
ProductsSpecificationsEditor scorePrice
Editor's Choice
Magnetic Key Box MM1 Regular
Inside 3.5×2.0x1.0 inch
Strong single magnet hold
Waterproof and portable design
4.6Editor score
Editor's Choice
2 Hide A Key Magnetic Under Car Spare Key Holder
2 premium quality magnets included
Tough ABS case stays closed
Measures 4 x 2 x 5/8 inch
4.6Editor score
Best Premium
Large Magnetic Key Box for Under Car
Holds bulky key fobs
Four magnet under-car mounting
IPX5 weather protection rated
4.3Editor score
Master Lock Magnetic Key Holder 207D
Stores 1 to 2 keys
Durable plastic sliding cover
Not intended for use on cars
4.5Editor score
Magnetic Key Box with Combination Lock
5 strong magnets for hold
4-digit resettable password code
Size 3.7 x 2.4 x 1.3 inch
4.2Editor score
Magnetic Key Holder Under Car Weatherproof
2 Neodymium magnets 60 lbs
2 holes for zip ties
Splash resistant with latches
4.7Editor score
Upgraded Magnetic Key Holder Under Car
3 neodymium magnets included
Soft cushion inside padding
Safety buckle design secured
4.6Editor score
Nite Ize Hideout Magnetic Key Box
Waterproof IPX7 rated
Includes adhesive metal plate
Extra large storage size
4.6Editor score
Magnetic Key Box with 3 Magnets
Super strong triple magnet
Waterproof and weatherproof
Made from great ABS plastic
4.6Editor score
Hide a Key Outside with our Grey Magnetic Box
2 strong Neodymium magnets
Air-tight waterproof box design
Reliable durable Gorilla Box
4.6Editor score
1. Magnetic Key Box, Hide A Key Holder – Best Overall Magnetic Key Box for under Car
Magnetic Key Box, Hide A Key Holder
Inside 3.5×2.0x1.0 inch
Super strong magnetic hold
Undercarriage placement design
Waterproof hide a key
This Magnetic Key Box stands out as a top choice for drivers needing reliable undercar storage. With a high customer rating and strong feedback on its magnetic hold, it ensures your keys stay hidden and safe during travel or daily driving.
Pros
- Strong magnets keep it secure
- Compact size fits easily
- Waterproof for outdoor use
- Easy to access when needed
- Ideal for extra security
Cons
- May need testing on rust
- Small inside dimensions only
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Its waterproof design and super strong magnet attachment make it suitable for various weather conditions. The compact internal dimensions are perfect for standard keys, ensuring it remains discreet and unlikely to be spotted by casual observers under your vehicle.
While the small size limits storage for bulky fobs, the secure fit offsets this limitation for many users. The portability and discreet placement ensure you can access keys quickly in emergencies without worrying about losing the box.
Ideal for those prioritizing security and simplicity, this box delivers consistent performance. It is a practical addition to any vehicle setup where quick access to spare keys matters most.
Secure Undercarriage Placement
Designed specifically for underneath the car, this box ensures discreet hiding that keeps keys protected from theft and weather elements.
Reliable and Durable Construction
With its magnetic hide a key car design, this super strong box provides a reliable and durable solution for hiding your keys securely.
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2. 2 Hide A Key Magnetic Under Car Spare Key Holder – Best Budget Magnetic Key Box for under Car
2 Hide A Key Magnetic Under Car Spare Key Holder
2 premium quality magnets included
Tough ABS case stays closed
Measures 4 x 2 x 5/8 inch
Great for small valuables
This budget-friendly key holder offers exceptional value with its inclusion of two premium magnets and durable ABS casing. Users appreciate its versatility in preventing lockouts across homes, vehicles, and offices while protecting keys from harsh outdoor elements.
Pros
- Avoid expensive locksmith calls
- Includes two premium magnets
- Tough against outdoor weather
- Great for hiding valuables
- Pre-measured jumbo size
Cons
- Small depth limits bulk storage
- Manual sliding open requires care
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The tough ABS case stays securely closed and protects keys effectively against rain and dirt. Its jumbo size allows for more than just keys, enabling storage of small valuables or notes without compromising security or accessibility.
However, the small depth may not accommodate very bulky key fobs, and the sliding mechanism requires firm pressure to open. Despite these minor trade-offs, the reliable performance and cost-effectiveness make it a top contender for budget-conscious buyers.
Perfect for those seeking affordability without sacrificing quality, this holder provides peace of mind. It is an essential accessory for anyone looking to avoid expensive locksmith calls and maintain secure key access.
Avoid Expensive Locksmith Calls
Use this key case to ensure you never get locked out of your home, office, or vehicle again saving money on professional services.
Versatile Hiding Capability
Great for hiding not just keys but also small valuables, money, notes, or tracking devices for enhanced security and convenience.
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3. Large Magnetic Key Box for Under Car – Best Premium Magnetic Key Box for under Car
Large Magnetic Key Box for Under Car
Holds bulky key fobs
Four magnet under-car mounting
IPX5 weather protection rated
Dual retention with latches
Designed for modern vehicles with bulky key fobs, this large box offers ample space for keys, cards, and cash. Its four-magnet mounting system and dual retention latches ensure it remains secure even on bumpy roads or high-speed driving.
Pros
- Large capacity for fobs
- Four magnets for stability
- IPX5 weather protection
- Optional zip tie retention
- Ideal for road trips
Cons
- Higher price point
- Not a Faraday case
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The IPX5 weather protection helps defend against rain and mud though prolonged submersion is not recommended. This makes it a robust choice for outdoor adventures or fleets where reliable access to spare keys is critical for safety and operations.
Although it is not a signal-blocking Faraday case, the size and latches provide strong physical security. The trade-off of higher cost is offset by the capacity and engineering that support heavier keys and varied mounting requirements.
Best suited for those needing extra storage and premium features, this box delivers performance. It ensures you never face a lockout situation while maintaining high security standards for your vehicle.
Large Capacity for Bulky Fobs
The housing holds bulky key fobs, multiple keys, trackers, and cards that may not fit in a regular key-box cavity.
Four Magnet Under Car Mounting
Four magnets distribute holding force across a clean, flat ferrous steel surface for reliable secure attachment underneath your vehicle.
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4. Master Lock Magnetic Key Holder 207D – Durable Plastic Magnetic Key Box for under Car
Master Lock Magnetic Key Holder 207D
Stores 1 to 2 keys
Durable plastic sliding cover
Not intended for use on cars
Built-in stop for cover
This Master Lock box is a reliable option for general key storage though its manufacturer notes it is not intended for direct car use. It features a durable plastic design with a sliding cover that includes a built-in stop to prevent the lid from falling off.
Pros
- Comfortably stores 1 to 2 keys
- Securely attaches to steel
- Durable plastic construction
- Built-in stop prevents loss
- Compact dimensions for storage
Cons
- Not intended for use on cars
- Limited storage capacity only
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Its exterior and interior dimensions make it perfect for storing one or two keys securely on any steel surface. The magnetic attachment is strong enough for sheds or garages, providing a simple way to keep spare keys accessible without exposing them.
Users seeking undercar placement should consider that this model lacks specific undercarriage engineering. However, for indoor or outdoor stationary storage, its durability and simple design offer consistent protection and ease of use.
Best for home or garage storage, this box provides reliable security for spare keys. While not optimized for vehicle undercarriage, it remains a trusted choice for general magnetic key hiding needs.
Securely Attaches to Any Steel Surface
The magnetic key box securely attaches to any steel surface ensuring keys stay hidden and safe in various indoor or outdoor locations.
Durable Plastic with Built-in Stop
Constructed of durable plastic featuring a sliding cover with built-in stop to prevent cover from being dropped or misplaced easily.
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5. Magnetic Key Box with Combination Lock – Secure Combo Magnetic Key Box for under Car
Magnetic Key Box with Combination Lock
5 strong magnets for hold
4-digit resettable password code
Size 3.7 x 2.4 x 1.3 inch
Soft sponge pads inside
Combining a combination lock with strong magnetic hold, this box offers enhanced security for your spare keys. The 4-digit resettable code ensures that only authorized users can access the keys, adding an extra layer of protection against theft or prying eyes.
Pros
- Stronger magnetic attraction
- Secure combination code lock
- Durable ultra-durable material
- Includes waterproof bags
- Anti-drop magnetic holder
Cons
- Reset code may be forgotten
- Heavier due to lock parts
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Equipped with five strong magnets, it sticks firmly to metal parts under the chassis even on bumpy roads. The ultra-durable material and soft sponge pads inside protect your items from scratches and wear over long-term use.
While the added lock mechanism increases weight slightly, the security benefits outweigh the minor inconvenience. The inclusion of waterproof bags further ensures that keys remain dry and functional regardless of weather conditions during placement.
Ideal for those prioritizing security with access control, this box delivers comprehensive protection. It is a practical solution for families or fleets needing secure key storage under a vehicle.
Stronger Magnetic Attraction
Equipped with 5 strong magnets which can be firmly fixed on any metal parts under the chassis even in complex road conditions.
Secure Combination Code Lock
Comes with a 4-digit password which can be reset at will making the hidden key safer and difficult for strangers to open.
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6. Magnetic Key Holder Under Car Weatherproof – Splash Resistant Magnetic Key Box for under Car
Magnetic Key Holder Under Car Weatherproof
2 Neodymium magnets 60 lbs
2 holes for zip ties
Splash resistant with latches
Removable padding inside
With two Neodymium magnets providing a separation force of 60 lbs, this holder stays firmly attached to your vehicle. The splash-resistant design and self-aligning retainer ensure that contents remain safe from light rain and road spray during typical driving conditions.
Pros
- High separation force of 60 lbs
- Alternative zip tie holes
- Large capacity for big keys
- Self-aligning retainer design
- Removable padding for more space
Cons
- Splash resistant only not fully waterproof
- Padding may need removal for space
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Its large capacity accommodates full sets of keys including bulky fobs and even small valuables like cash or watches. The dark color makes it harder to see, and the zip tie holes offer an alternative mounting method if magnetic surfaces are unavailable.
The removable padding allows customization of storage space, though some users may prefer it for noise reduction. While not fully submersible, it offers reliable protection for most daily needs with strong magnetic security.
Best for those needing strong hold and flexibility, this box is a reliable companion. It keeps your keys safe and accessible without sacrificing versatility or storage capacity.
Strong Magnetic Separation Force
With 2 Neodymium magnets it can be attached to nearly any metal surface with a separation force of 60 lbs ensuring it stays secure.
Large Capacity Storage
The key hider can fit your big keys and meets multiple storage requirements such as airtag, door keys, or USB drives.
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7. Upgraded Magnetic Key Holder Under Car – Safety Buckle Magnetic Key Box for under Car
Upgraded Magnetic Key Holder Under Car
3 neodymium magnets included
Soft cushion inside padding
Safety buckle design secured
Weatherproof tested environments
This upgraded model features thicker construction and three neodymium magnets for reliable holding power on vehicle frames. The safety buckle design ensures the box stays closed even under stress, providing peace of mind during long drives or rough terrain.
Pros
- Thicker than other brands
- 51lbs breakaway force
- Soft cushion inside protection
- Upgraded safety buckles
- Waterproof tested in snow
Cons
- Padding may be removable
- Limited to metal surfaces
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Inside, a soft cushion protects keys from scratches though it can be removed if more space is needed. Its weatherproof design has been thoroughly tested in snow, rain, and mud making it a versatile choice for all-season use.
The sturdy build and safety features highlight a focus on durability and user safety. It is an excellent option for those who need a reliable container for keys or other small emergency items like GPS trackers.
Best for those seeking enhanced durability and internal protection, this holder delivers. It combines strong magnetic hold with thoughtful design features to keep your valuables safe under your vehicle.
Safety Buckle Design
Boasts a design with upgraded safety buckles that endure repeated bending without detachment keeping your contents secure.
Soft Cushion Inside Protection
Equipped with a soft cushion inside to better protect your belongings from scratches while keeping them secure during travel.
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8. Nite Ize Hideout Magnetic Key Box – Waterproof Magnetic Key Box for under Car
Nite Ize Hideout Magnetic Key Box
Waterproof IPX7 rated
Includes adhesive metal plate
Extra large storage size
Secure neodymium magnets
Designed by Nite Ize this waterproof box offers IPX7 protection ensuring your keys stay dry even in heavy rain. The powerful neodymium magnets keep it secure on metal surfaces, while the included adhesive plate allows attachment to wood or plastic.
Pros
- Waterproof IPX7 rated
- Durable construction
- Adhesive metal plate included
- Extra large storage
- Worry Free Guarantee
Cons
- Requires metal plate for non-metal
- Premium price for brand
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Its extra-large storage capacity accommodates keys and other items securely. The durable construction and Worry Free Guarantee reflect a commitment to quality and customer satisfaction making it a trusted choice for outdoor enthusiasts and families.
While the adhesive plate adds versatility, non-metal attachment requires proper surface preparation. The premium price is justified by the brand reputation and robust waterproof performance that protects keys against harsh conditions.
Ideal for those prioritizing waterproof reliability and brand trust, this box delivers. It is a versatile solution for protecting keys across various surfaces and environments safely.
Waterproof Key Holder
This magnetic key box is waterproof IPX7 and durable keeping your contents safe and dry in any weather condition.
Versatile Key Storage Box
Attaches to wood plastic and metal including a metal plate for attaching hideout to non-metal surfaces securely and effectively.
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9. Magnetic Key Box with 3 Magnets – Triple Magnet Key Key Box for under Car
Magnetic Key Box with 3 Magnets
Super strong triple magnet
Waterproof and weatherproof
Made from great ABS plastic
Perfect for trucks and SUVs
Featuring three powerful magnets, this box offers maximum-strength hold on any ferrous surface. Its rugged ABS construction ensures it resists rust and weather, keeping your keys functional in extreme conditions whether you drive a truck or an RV.
Pros
- Super strong triple magnet
- Waterproof against rain and snow
- Rugged and durable ABS
- Perfect gift for outdoors
- No tools required install
Cons
- Simple slide lid mechanism
- Basic design features
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Installation requires no tools simply place the spare key inside, close the lid, and attach to a clean metal surface. The low-profile design ensures it does not interfere with driving or become an eyesore under your vehicle.
While the lid mechanism is simple, the triple magnet setup provides reliable security on rough roads. It serves as a practical solution for emergencies and outdoor activities, ensuring peace of mind during travel.
Best for those needing simple yet strong protection, this box delivers. It is an ideal gift for car owners or mechanics looking for reliable key storage.
Super Strong Triple Magnet
Unlike standard boxes it is equipped with 3 powerful magnets providing maximum-strength hold on any ferrous surface securely.
Easy to Install and Use
No tools required Simply place your spare key inside and attach the box to any clean metal surface underneath your vehicle.
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10. Hide a Key Outside with our Grey Magnetic Box – Air-Tight Magnetic Key Box for under Car
Hide a Key Outside with our Grey Magnetic Box
2 strong Neodymium magnets
Air-tight waterproof box design
Reliable durable Gorilla Box
Ideal magnet key box solution
This grey magnetic box ensures your keys are safely stored and easily accessible when needed. Its waterproof air-tight design protects against moisture while two strong Neodymium magnets keep the box securely attached to your car.
Pros
- Convenient and secure access
- Strong magnetic hold
- Waterproof air-tight design
- Designed for undercarriage placement
- Reliable and durable
Cons
- Simple lid mechanism
- Grey color may vary
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Designed specifically for undercarriage placement, it ensures discreet hiding of your keys to prevent theft. The reliable and durable Gorilla Box construction provides peace of mind that your keys remain hidden and protected.
While the lid mechanism is straightforward, the air-tight seal offers excellent protection against water. It is an ideal choice for anyone seeking a secure and discreet solution for under-vehicle key storage.
Best for those prioritizing secure and discreet storage, this box delivers. It offers reliable performance and peace of mind for everyday use.
Strong Magnetic Hold
Our magnetic key box features a powerful magnet securely attaching to your car without the risk of falling off reliably.
Undercarriage Placement
Designed specifically for under car placement ensuring discreet hiding of your keys for added security and peace of mind.
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Buying Guide – How to Choose the Best Magnetic Key Box for under Car
Choosing the right magnetic key box for under car requires understanding several factors. We explain what to look for to ensure secure and reliable storage.
Magnet Strength and Quantity
Magnet strength is critical for keeping the box secure under a vehicle. Look for products with multiple Neodymium magnets or high separation forces to ensure they do not detach during high-speed driving or on rough terrain.
Prioritize models with at least two or three magnets for reliable attachment on any metal surface.
Weatherproofing and Durability
Exposure to rain, snow, and road spray demands strong weather resistance. Choose boxes with waterproof seals or IPX ratings to protect keys from moisture and corrosion over time.
Ensure the material is rugged such as ABS plastic to resist wear and tear from environmental elements.
Storage Capacity and Size
Size matters when storing bulky key fobs or multiple keys. Check internal dimensions to ensure your keys fit comfortably without forcing the lid open.
Select a box that balances discreet size with enough room for your specific key type or small emergency items.
Security Features and Access
Some boxes offer combination locks or zip-tie holes for added security. These features provide extra protection but may increase weight or complexity compared to magnetic-only designs.
Decide if extra locking mechanisms are necessary for your security needs versus simpler magnetic options.
Installation and Mounting Options
Ease of installation ensures you can secure the box without tools. Look for designs with clear instructions and pre-measured sizes to avoid guesswork during placement.
Consider products with adhesive plates or extra holes for zip ties to expand mounting versatility.
Brand Reputation and Warranty
Choosing established brands often means better customer support and product warranties. A worry-free guarantee or strong reviews can indicate reliable performance and longevity for your investment.
Verify customer ratings to ensure the product meets real-world durability standards.
How to Use and Care for Your Magnetic Key Box for under Car
To install, clean the metal surface under your vehicle and ensure it is free of rust or debris. Place your spare key inside the box close the lid securely and press the magnets firmly against the frame or chassis.
Regularly check the box attachment and seals to ensure it remains secure during driving. If the seal or lid shows signs of wear replace the box to maintain waterproof integrity and avoid losing keys.
Test the magnetic hold by pulling gently before driving to confirm stability. Avoid placing the box near moving parts or heat sources to prevent damage to the key or the container.
Frequently Asked Questions
How strong must the magnet be for a car?
Look for a box with a separation force of at least 40 to 60 pounds to ensure it stays attached during high-speed driving. Multiple Neodymium magnets generally provide the best security against vibration and wind resistance.
Will these boxes protect keys from water?
Many models are splash resistant or waterproof but always check the specific IP rating or seal design. For heavy rain or driving through puddles consider storing keys in an additional zip lock bag inside the box.
What if my key fob is too big?
Check the internal dimensions of the box before purchasing. Some larger models are designed specifically to fit bulky key fobs and accessories while compact versions may not accommodate them comfortably.
Can I use the box on non-metal surfaces?
While most rely on magnets some include adhesive metal plates or zip-tie holes for non-metal attachment. Verify the product details for alternative mounting methods if your vehicle lacks a ferrous surface.
Is it safe to hide keys under a car?
Yes it is generally safe if you place it on a clean flat steel surface away from heat or moving parts. Ensure the box is tested and secure before driving to prevent it from falling off unexpectedly.
How often should I check the key box?
Inspect the box monthly for signs of rust or loose seals especially if you live in wet or salty climates. Regular checks ensure the keys remain dry and the box stays securely in place.
Final Thoughts on Choosing the Best Magnetic Key Box for under Car
We highlighted ten top magnetic key boxes for under car each offering unique features from budget-friendly options to premium waterproof designs. Choosing the right one depends on your vehicle type and key storage needs.
Prioritize magnet strength and weatherproofing to ensure your keys stay safe in any condition. A durable and secure box can prevent lockouts and provide peace of mind during travel.
Remember that prices and availability may change over time so verify current details before purchasing. With the right magnetic key box you can ensure your keys are always secure and accessible.