TIME-SERT BIG-SERT M14x1.25 SPARK PLUG KIT SHORT WITH ASSORTED INSERTS P/n 5141S-457 BIG-SERT OVERSIZED SPARK PLUG REPAIR KIT for use when a helicoil has failed P/N 5141S-457 M14x1.25 BIG-SERT kit includes 8 assorted length inserts Reliable Fast Permanent repair P/N 5141S-457 Professional repair tools for a high quality repair by TIME-SERT Used after helicoil failure or inserts .660 or smaller in diameter