The Select Access 83 mm Portable Combination Key Storage Safe Box is used to store up to 5 keys. Over-the-door knob design makes it easy for installing it anywhere. Moulded metal construction of the box provides durability and the vinyl coating on the shackle prevents scratching. Large internal cavity that reduces jamming while storing keys. Four-digit numerical combination locking mechanism avoids the use of keys for convenience and optimal security.Reinforced design endures hammering and sawing. Shutter door protects the dial from weather, dirt or grime. It measures 78 mm x 68 mm x 34 mm internally and is ideal for both indoor and outdoor use.