TIME-SERT Big-Sert 5112D M11 x 1.25 Oversized Metric Thread Repair Kit BIG-SERT Oversized Metric Kit M11 X 1.25 Part # 5112D M11x1.25 BIG-SERT OVERSIZED REPAIR FOR FAILED HELICOIL The kit includes:Drill counterbore tap tap guide sealer install driver 5 inserts 30mm length. This kit was originally made for some Nissan blocks where the head bolts started at the top of the block. Short tooling could be used.