KeyGuard Portable Car Lock Box SL-591 Black — Metal Combination Key Safe with Protective Cover

The KeyGuard SL-591 is a portable, metal car-window lock box that stores keys, fobs and small valuables behind a weatherproof rubber cover and opens with a changeable punch-button combination.

The SL-591 by KeyGuard is built for vehicle owners, landlords and car-rental hosts who need a dependable, low-friction way to share access without handing over a physical key. Its full-metal vault, anti-oxidation finish and thick rubber protective cover keep the contents sheltered from weather and prevent the box from scratching your car. Large punch buttons make code entry straightforward, while a changeable combination lets you control who gets access and when.

How secure is the KeyGuard SL-591 against tampering?

The SL-591 combines a solid metal body with an anti-oxidation coating and a robust metal frame to resist forced entry attempts. The protective rubber cover conceals the keypad and reduces leverage points, and the automatic lock action engages when the door closes.

• Full zinc-alloy body with anti-corrosion finish for long-term durability
• Internal metal frame adds structural strength
• Protective rubber cover hides the keypad and reduces tampering
• Automatic locking when the door closes prevents accidental openings

What fits inside and how big is the storage area?

Designed to hold modern car fobs, multiple keys and small personal items, the interior dimensions provide more room than many compact key safes. It accommodates standard fobs, key rings and small documents while still keeping the profile compact for window mounting.

• Internal height: 4.0 inches — fits most key fobs and grouped keyrings
• Internal width: 2-3/8 inches — room for multiple keys or a slim wallet
• Internal depth: 1-1/8 inches — suitable for low-profile fobs and cards
• Diagonal clearance: 4-3/8 inches for angled or bundled items

How easy is it to set or change the combination?

The punch-button keypad uses large, tactile buttons to make code entry and changes simple for all users, including those who have difficulty with small keys. Changing the combination is done with the supplied tool and a straightforward procedure, so you can give temporary access and then reset the code afterward.

• Large punch-button layout for fast, confident dialing
• Includes tool and instructions to change the code securely
• Supports letter or number combinations for flexible passwords
• No electronic parts — no batteries required for operation

How does the protective cover help in daily use?

The thick rubber cover protects the lockbox from rain, dust and incidental knocks while preventing the metal back from scratching your vehicle’s paint. It also conceals the keypad from casual observation, adding privacy and deterring opportunistic tampering.

• Weatherproof rubber skirting keeps the interior dry and clean
• Non-abrasive material cushions the contact points against glass
• Conceals the keypad to reduce visibility to passersby
• Helps the box sit evenly against the vehicle window for stable mounting

Who is this product for? The KeyGuard SL-591 is ideal for car-sharing hosts, vacation-rental managers, rideshare drivers, property landlords and vehicle owners who need a secure, no-fuss way to hand over access. If you want a mechanical, low-maintenance solution that resists corrosion, hides the keypad, and fits modern fobs without batteries or electronics, this lock box is a practical everyday choice. It’s also useful for households that share keys with family members, caretakers or service providers and need an easy-to-change code for temporary access.