DURABLE DESIGN: Lockable key storage designed to fit over a door knob for portable use; metal body construction for durability and shutter door to protect combination dials from weather EASE OF USE: Resettable 4 digit combination for keyless convenience, set and reset your combination allowing thousands of personalized combination code options LOCK BOX APPLICATION: For indoor and outdoor use; key safe is best used for key and access card storage; large internal cavity allows secure storage for multiple keys IDEAL FOR SMALL SET OF SPARE KEYS: Exterior dimensions (H x W x D) 15,7cm x 9cm x 4cm ; Interior dimensions (H x W x D) 7,4cm x 6,8cm x 3cm, Weight: 1.02955876354 pounds, Manufacturer: Master Lock