5/16-18Thread RepairKit Features and Benefits:All kits contain a Heli-Coil tap, installation tool, a quantity of insert and detailed instructions12 Inserts. Drill Size: 21/64
3/8-16Thread Repair Kit Features and Benefits: All kits contain a Heli-Coil tap, installation tool, a quantity of insert and detailed instructions12 inserts. Drill Size: 25/64