This Masterlock 5404E will hold a single key which is permanently affixed to the storage compartment UK's No 1 Hand and Power Tool Seller BEST BRANDS AT BEST PRICES Draper, Sealey, Bahco, Stanley and Much More.. This Masterlock 5404E will hold a single key which is permanently affixed to the storage compartment's removable cartridge to prevent misplacing the key after use. The 5404E is a strong sturdy key safe that is a wall mount design for permanent installation. The 5404E has a set-your-own 4-digit combination for keyless convenience and sized to easily fit between storm door and entry door or other small spaces. The Masterlock key safe has a plastic cover to protects the combination dials from weather, dirt and grime and a Integrated LED illuminates the dials for easier night-time access. The Masterlock 5404E can resist sawing and hammering and makes an ideal storage system if you do loose your key.