[WIDE APPLICATION] - It is an excellent code key box for storing keys and bank cards, etc. [HIGH SECURITY] - Our wall mounted key safe is made of a plastic body high quality aluminum alloy and a durable steel locking mechanism, which provides additional strength to the exterior key box to withstand hammering or drilling attacks. [4-PIECE COMBINATION RELIABLE NUMBERS] - Uses a 4-digit combination to provide robust protection. [MINI SIZE & EASY USE] - External size (H x W x D): 3.7 x 2.95 x 1.37 inches, Internal size (H x W x D): 3.2 x 2.75 x 1.1 inches. [EASY TO USE] INSTALL] - Only 4 simple steps to complete the installation: Drawing the outline of the screws Drilling the holes Nailing in the expanded anchors Installing the box using screws.