Same as the HIT-41HS1 but for 5000 and 5700 SERIES strikes equipped with the 503 option. Faceplate size is 1-1/4" x 6-7/8" 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 dead bolt strike. Requires a router with a 3/8" outside diameter template guide and a 1/4" diameter router bit. (Part # for our router bit is HIT-45RB4). For use on offset hung aluminum doors and frames only.