E-Z Coil Thread Repair Kit for Metal - Economy - 5/16-18x2DEverything needed to repair or reinforce tapped holes in metal in a convenient, easy-to-order kit.FeaturesEconomy kits include threaded inserts, STI tap, and installation tool.Kit Contains: (10x) 20920, (1x) M1010, (1x) 20970Applications:Soft metals: aluminum, cast iron, magnesium, etc.