This lock and door reinforcer is constructed of stainless steel and fits 1-3/8 in. thick doors. Assists in preventing forced entry by reinforcing the weak spot of an entry door, and it can be used on both metal and wood doors. Accommodates key-in knob locksets on doors that have 2-1/8 in. bore sizes, with a backset of 2-3/8 in, The width of this door guard is 3-7/8 in. and measures 4-1/2 in. tall. These door reinforcers are easy to install and they are used by many. All installation fasteners are included with this item.