- External size (HxWxD): 4.53 x 3.43 x 2.16in, Internal size (HxWxD): 3.94 x 3.15 x 1.18in. The large storage capacity is enough to store key chains, bank cards, car keys, cash or other small items. - The key box with anti-rust code is made of PVC sturdy, aluminum alloy and durable steel locking mechanism, which provides additional strength to the box to withstand hammering or drilling attacks. - Key code box uses a 12-digit multiple combination to provide 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. - It is an exterior key box of value for indoor and outdoor use, suitable for storing keys, cards and jewelry. In order to facilitate access, your friends, family and neighbors can obtain a spare key in the secure key safe when you are not at home.