Big-Sert 3/8-16 Oversized repair kit includes: Drill, counterbore, tap, tap guide, install driver & high temp sealer (Qty 5) inserts of the 1.000 length P/n 53815 BIG-SERT OVERSIZED Use after a failed coil style failure. The depth of hole must be at least 1.250 deep. If you need a kit with a shorter .750 reach insert see kit p/n 5381F