Quickly and permanently restores stripped, worn or damaged threads to their original size and condition. The hard, stainless steel (18-8) diamond shaped wire inserts work in just about any part or material; aluminum, magnesium, cast iron, bronze, etc. The insert has a driving "tang" for installation which is notched for easy removal. Kit contains a Heli-Coil tap, installation tool, a quantity of inserts and detailed instructions, packaged in durable placon or vinyl pouches.