- External size (HxWxD): 4.53 x 3.43 x 2.16in, Internal size (HxWxD): 3.94 x 3.15 x 1.18in. Large storage capacity is enough to store key fobs, bank cards, car keys, cash or other small items. heavy duty, aluminum alloy and durable steel locking mechanism, which provides extra strength to the box to resist hammering or drilling attacks. - Code key box uses a multiple 12-digit combination to ensure robust protection. - The waterproof exterior key box comes with instructions in 5 languages, a screwdriver and a kit assembly (4 screws + 4 expansion plugs). Only 4 simple steps to complete the installation: Draw the outline of the screws Make the holes Nail in the expanded plugs Install the box by the screws. value for indoor and outdoor use, suitable for storing keys, cards and jewelry. For easier access, your friends, family and neighbors can get a spare key from the secure key safe when you're away from home.