This Master Lock wall mounted push button lock box provides convienience and security for keys, the perfect solution for shared key access. Set your own combination of up to 12 letters and numbers. For permanent installation. The lock box has a metal body for durability, a protective weather cover to prevent freezing and jamming, also a molded bumper and vinyl coated shackle prevents scratching. Push button access, with large buttons is very easy to use, with gloves, by the elderly or children. Exterior measurements are W790 x D520 x H1107mm.