The Defender Security MP9455 Stainless Steel Lock and Door Reinforcer assists in preventing forced entry by reinforcing the weak spot of an entry door. It can be used to reinforce and repair both metal and wood doors. Made of stainless steel, the lock reinforcer plate comes in a natural finish. All the necessary mounting hardware is included for a quick and easy installation. The lock reinforcement plate is pre-punched for mounting. The reinforcer is designed for 1-3/4 inch thick doors that have mortise or drive-in latches. Measuring 3-7/8 inch wide by 4-1/2 inch tall, the reinforcement plate accommodates key-in knob locksets on doors that have 2-1/8 inch bore sizes, with a backset of 2-3/8 inch. The door reinforcer is non-recessed.