NS300L™ M12X1.5 HEAD BOLT THREAD REPAIR, FIT'S HEMI GEN 3 5.7, 6.1, 6.2 & 6.4

I am a Tool and Die Maker/Machinest by trade and I developed the NS300L™ Insert System out of necessity and frustration. The NS300L™ Insert System is a head bolt thread repair system engineered to outperform all other kits on the market for aluminum engine blocks.