The Master Lock 5401D Wall Mount Lock Box features a 3-1/4 in. (83 mm) wide metal body for durability. The wall mount design offers permanent installation. Set your own 4-digit combination for keyless convenience and increased security. The shutter door protects combination dials from weather, dirt and grime, and molded body and vinyl coated shackle prevent scratching. The Limited Lifetime Warranty provides peace of mind from a brand you know and can trust. Features: Large capacity key lock box enables secure storage of up to five keys, designed for installation to a wall or fixed object (hardware included) Set your own four-digit combination lock box, Reset the combination for thousands of personalized combination code options For indoor and outdoor use, key safe is constructed with a metal body for durability and shutter door to protect combination dials from weather Exterior dimensions: 4-3/4 in. (12 cm) H x 3-1/4 in. (8.3 cm) W x 1-1/2 in. (3.8 cm) D Interior dimensions: 3-1/4 in. (8.3 cm) H x 2-1/4 in. (5.7 cm) W x 1 in. (2.5 cm) D, 7.3 cu in. (18.5 cu cm) volume