This Master Lock Magnetic Car Case is designed for discreet placement of 1-2 spare keys, ideal for hiding your key and attaching it to your car's underside. It securely attaches to any steel surface thanks to its magnetic design. The durable plastic construction is rust-free, and it features a sliding cover with a built-in stop to prevent it from being dropped or misplaced. The case measures (HxWxD) 2.9 x 5.1 x 11.9 cm. It comes with a Limited Lifetime Warranty.