Recoil inserts are the quick and easy way to repair damaged threads or create stronger original threads in alloys and composite materials in original equipment manufacture. Made from corrosion resistant stainless steel, they create stronger threads in most materials and simplify changeover from unified to metric or vice versa. Recoil thread repair kits contain a quality HSS tap, installation tool, precision stainless steel inserts and instructions. Supplied in a sturdy container. M5-0.8mm M6-1.0mm M8-1.25mm M10-1.5mm M12-1.75mm