Route the opening required for Adams Rite 4502/4902 strikes used on 4711 locks. Fastens to door jamb with two self drilling screws (supplied). Simply route opening, screw holes are used to locate factory mounting bracket, deburr and install. Indicator marks insure proper alignment. Can be used on both offset and center hung doors. Requires the use of a router equipped with a 3/8" outside diameter guide and a 1/4" router bit.