E-Z Coil Thread Repair Kit for Metal - Economy - 3/4-16 x 2DEverything 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: (5x) 31520, (1x) M1021, (1x) 31570Applications:Soft metals: aluminum, cast iron, magnesium, etc.