QUICKLY REPAIR DAMAGED THREADS – Quickly repair damaged threads or reinforce tapped holes in metals with this thread repair tool kit. CARBON STEEL INSERTS – Kit includes standard carbon steel threaded inserts that are easy to install with standard tools. FOR USE WITH APPLICATIONS – The metal threaded inserts are designed for use with soft metals: aluminum, cast iron, magnesium, etc. KIT INCLUDES – Convenient kit includes Thread Repair Kit for Metal Carbon Steel Threaded Inserts drill, tap, and threaded insert installation drive tool