Clcoil thread repair kits help prevent costly machine downtime Range Kits, a multiple size kit format, are widely used in maintenance workshops. A quantity of Clcoil thread inserts, the appropriate size drill, high speed steel tap, installation tool, a tang break tool in the Kit. The Single set is from M5 to M14 (Metric Size ) ;1/4-1/2 (UNC;UNF) ; Fitness Kit is include 5 sizes (M5;M6,M8;M10;M12 ) .