This is a stainless steel door reinforcer. Helps prevent a forced entry. Typically used on wood or metal doors that are 1-3/4 in. thick with mortise or drive-in latches. Accommodates key-in knob locksets or deadbolts, or combination locksets. It features one 2-1/8 in. bore with a 2-3/8 in. backset. Dimensions are 3-7/8 in. wide and 9 in. tall.