Master Lock Lock Box, Set Your Own Combination Portable Key Safe, 2-3/4 in. Wide, 5406D LOCK BOX APPLICATION: For indoor or outdoor use; small portable lock box is best used for key and access card storage; holds 1-2 keys for a house or car EASE OF USE: Resettable 3 digit combination for keyless convenience, set and reset your combination allowing thousands of personalized combination code options DURABLE DESIGN: Lock box made to fit over a door knob for portable use; metal body and shutter door for durability, vinyl coated shackle to prevent scratching; Fits most ball, biscuit, and tulip door knob styles SPECIFICATIONS: 2-3/4 in wide lock body; 13/32 in. diameter shackle with 1-13/32 in. length, 1-7/8 in. width; Internal dimensions: 1 in. height, 2-1/4 in. width, 3/4 in. depth