BIG-SERT by Time-Sert M12 X 1.50 Oversize Thread Repair Kit # 5215 BIG-SERT is a heavy wall solid bushing, easy to install with positive placement. BIG-SERT gives increased load protection for critical use. BIG-SERT will repair oversize holes which have previously been repaired. This is a complete kit including: drill bit, counterboring tool, tap, inserting tool, and 5 inserts!