Big-Sert 3/8-16 Oversized repair kit includes: Drill, counterbore, tap, tap guide, install driver & high temp sealer (Qty 5) inserts of the 1.250 length P/n 53817 BIG-SERT OVERSIZED Use after a failed coil style failure. Be aware in blind holes the hole must be at least 1/4" inch deeper than the inserts length. Minimum hole depth should be 1.500" inches.