The Master Lock Lock Box Surface is a lockable metal box that provides secure storage for keys and small valuables. It has a shackle locking mechanism with a 3 digit combination lock and measures 5.75 x 3.75 x 2 inches. The box is made of 20 gauge steel with a powder-coated gray finish and has pre-drilled holes for easy mounting. It can be used for storing keys, wallets, jewelry, cash, and other small items. The combination lock allows the box to be opened without a key.