LOCK BOX APPLICATION: For indoor and outdoor use ; large internal cavity allows secure storage for multiple keys EASE OF USE: Resettable 4 digit combination for keyless convenience, set and reset your combination allowing thousands of personalized combination code options 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 IDEAL FOR SET OF KEYS: shackle dimensions (refer to visuals) a: 9mm B: 37mm C: 48mm; Exterior dimensions (H x W x D) 18, 8cm x 10, 5cm x 4, 3cm; Interior dimensions (H x W x D) 10, 1cm x 6, 4cm x 3, 2cm EASY TO SECURE AND SHARE YOUR KEYS: Great solution for AirBNB and home rental. Gives easy access to care takers and home workers. Ideal to share keys with your family or roomates GREAT FLEXIBILITY : portable model with shackel, can be placed on doors, barriers, portals or anywhere else; very convenient for collective ownership and rental as no need to fix it to the wall, Weight: 2.138 pounds, Manufacturer: Master Lock