Coil-Sert™ has the simplest and most cost efficient way to repair stripped or damaged threads. Inserts quickly and permanently restore stripped, worn or damaged threads to their original size and condition. Works in any material: aluminum, magnesium, bronze, cast iron, etc. Suitable for new applications requiring stronger threads. Meets all military and industrial specifications. Thread Repair Kits include : 1 H.S.S. Drill, 1 S.T.I. (Screw Thread Insert) Tap, 1 installation tool, a quantity of inserts, and complete instructions.