Review on E-Z Lok EK51210 Metric Helical Threaded Insert Kit, High-Quality 304 Stainless Steel, M16-1.5 Thread Size, 16 mm Installed Length (Pack of 5) by Alan Estell

Good: The tap and the tool worked great and are of good quality. Terrible: The spiral coils in my kit were the wrong size. I ended up buying more from Helicoil for a little over $10 a box. These were smaller than what I received in this kit which ended up fitting properly. I spent hours installing the wrong size coil spools that kept breaking shanks after barely putting them in, which were shipped in my kit. This was annoying and also delayed my work of sending the correct sizes. I wanted to return it but the tooling was damaged, all the coils were destroyed and I would have preferred to keep the tool and tap. Not sure what happened on the other end of the confusion, but I wasn't happy even after getting the correct size spiral coils and putting them in with no problems.