Defender Security U 9573 Door Reinforcer 1-3/4-Inch Thick by 2-3/8-Inch Backset 2-1/8-Inch Bore, Antique Brass Solid brass construction; antique brass finish Use on wood or metal doors with mortise or drive-in latches Accommodates key-in knob locksets or deadbolts Easy to install Helps prevent break-ins