Review on Highking Tool Thread Repair Kit: Complete M6 x 1.0mm Thread Repair Insert Set for Auto Repairing by Jeremy Black

I have one of the M8 kits and it worked fine but this M6 kit failed miserably. The spool offered too much resistance during insertion, causing the insertion tool to break in the hole. So I had to drill out the broken tool and buy a quality Helicoil brand thread repair kit locally. Sure, it cost twice as much, but it worked great. It's useless if it doesn't work properly and requires extra work and expense. I will never buy these sets again. I think I got lucky with the first one.