Prime-Line Defender Security Lock & Door Reinforcer Solid Brass Part # U-9550 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 or deadbolts. The Lock & Door Reinforcer is for Door Thickness of 1-3/4". It has a Bore size of 2-1/8". The Backset is 2-3/4". The Reinforcer width is 4-5/16" and the Height is 9".