They're beautiful, reliable and far superior to OEM. HOWEVER, either the factory taps were worn out or the coating was reducing the thread size. 45 minutes wasted tapping each nut again. They used to work well, but simple jobs took too long. Keep in mind that these may not be for you if you don't have the skills and tools (a 12x1.5 tap and wrench and a heavy duty vise). The time involved was less than a trip to UPS so I didn't bother with returning it.