You'll find below what we believe are the 4 best choices in thread repair inserts and how they work. After about 40 years experience supplying thread inserts and tooling we'd like to say there isn't just one answer to the questions above because every job is different. You've found your Australian importer of thread repair inserts & tools - Time-Sert, Helicoil compatible wire type, Keensert, E-Z Lok, ensat, tapper and self tapping thread inserts and alternatives used for thread repair or in OEM manufacture.