Used to install Rutherford L6500 LOW PROFILE SERIES 4-7/8" ASA electric strikes. Faceplate size 1-1/4" x 4-7/8". Mounts to door or frame with self-drilling screws (supplied). Requires the use of a router with a 3/8" outside diameter guide and a 1/4" diameter router bit.  For use on offset hung aluminum doors and frames only.