E-Z Coil Thread Repair Kit for Metal - Economy - 5/8-18 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) 31420, (1x) M1018, (1x) 31470Applications:Soft metals: aluminum, cast iron, magnesium, etc.