Prime-Line Solid Brass Lock and Door Reinforcer 1-3/8 in. x 4-1/2 in. (1-3/8" x 4-1/2")This lock and door reinforcer is constructed of solid, polished brass and fits 2 1 8 in. bores on 1 3 8 in. doors. This security device 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 a backset of 2 3 8 in. These door reinforcers are easy to install and they are used by many. All installation fasteners are included