Stack-On IWC-55 Full-Length In-Wall Cabinet Includes a removable steel shelf The bottom of the cabinet and the shelf have foam padding to protect your valuables. The steel door has a 3 point locking system that secures the door at the top and bottom as well as the opening side of the door. External Dimensions: 15-3/8"W x 3-7/8"D x 54-3/4"H Internal Dimensions: 14" W x 3-7/8"D x 53-1/4"W;Fits up to 2 long guns, Mounts between standeard 16 inches on center stud walls