Heli Coil metric coarse thread repair kit includes inserts, complete instructions, Heli-Coil tap and installation tool. It is made from high quality material and is extremely long lasting. This metric coarse thread repair kit is used for repairing tapped holes which have been stripped or damaged, due to wear, corrosion and over torque. M8 x 1.25 x 12.0MMQuickly and permanently restores strippedWorn or damaged threads to their original size and conditionStainless steel (18-8) diamond shaped wire inserts work in just about any part or materialThe insert has a driving "tang" for installation which is notched for easy removal