Used to install HES 5200 x 503 option electric strikes with a 1-1/4" x 6-7/8" faceplate with round corners. This strike is used when removing a deadbolt lock and replacing it with a deadlatch. The larger faceplate covers the long opening left by the deadbolt strike. Mounts to door or frame with self-drilling screws (supplied). Requires the use of a router equipped with a 3/8" outside diameter template guide and a 1/4" diameter router bit. For use on offset hung aluminum doors and frames.