Master Lock Portable Key Lock Box with Push Button Resettable Combination Lock, Outdoor Key Lock Box, 5422D BlackLOCK BOX APPLICATION: For indoor or outdoor use; portable lock box is best used for key and access card storage; large internal cavity allows secure storage for multiple keysEASE OF USE: Resettable combination for keyless convenience, set your own combination using familiar alpha/numeric keypad; large buttons make it easy to enter combinationDURABLE DESIGN: Lock box made to fit over a door knob for portable use; metal body and weather cover for durability, vinyl coated shackle and molded bumper prevent scratching; Fits most ball, biscuit, and tulip door knob stylesSPECIFICATIONS: 3-1/8 in. wide lock body; 13/32 in. diameter shackle with 1-5/6 in. length, 1-13/32 in. width; Internal dimensions: 3-1/2 in. height, 2-1/4 in. width, 1 in. depth