Prime-Line Products U 9577 Non-Recessed Door Reinforcer Combo 1-3/4-Inch Thick by 2-3/8-Inch Backset 2-1/8-Inch Bore, Antique Brass Reinforces and repairs doors Assists in preventing forced entry Use on wood or metal doors with mortise or drive-in latches Accommodates key-in knob locksets and deadbolts Also accommodates combination locksets