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" Designed to make the perfect Harlot Firing Pin from threaded rod, It will also make firing pins for many other projects that require either a chisel point for rimfire or quad-angle point for many center fire applications using M3-M4-M5 all-thread. It is a simple hand powered tool for the person without a full workshop. It works by utilizing a sledded file and a colleted screw mounted in a constant tension trunnion. There are many ways to make a firing pin, this is just mine. Enjoy - PsychicRhino"