Defender Security U 9590 Lock & Door Reinforcer, 2-1/8 in. x 2-3/8 in. x 1-3/4 in., Stainless Steel Used to reinforce and repair doors to aide in preventing forced entry Fits 1-3/4 in. thick doors, 2-1/8 in. bores, 2-3/8 in. backset, 3-7/8 in. width x 4-1/2 in. height Stainless steel Stainless steel Reinforces and repairs doors Helps prevent break-ins Use on wood or metal doors with mortise or drive-in latches Accommodates key-in knob locksets or deadbolts For 2-3/8in. backset and 1-3/4in. door thickness