From Jim Chambers. All kits come with complete assembly instructions, including heat-treating instructions that are geared toward the home workshop. All holes to be drilled in the plate are spotted. Drill guides are included to aid you in the accurate location and drilling of the bridle. All springs included in the kit have been professionally hardened and tempered and have been pre-tested. All parts are made of high quality carbon steel designed for relative ease of machining while giving years of tough, wear resistant service when properly heat-treated.

Same as our assembled Large Siler Percussion Lock (#42SL7) in kit form. Requires #19 drill and 8-32 tap. Top quality, Percussion Lock. Plate is 5-1/4" long, 15/16" wide.  No. 44SL7K