I wanted a larger step drill bit for my screwdriver/hex bit. It was a great prize for all three. The quality was ok for drilling. I had an issue with the largest nozzle and it wasn't done right, and the hex end was poorly done and didn't fit any of the hex connectors. I solved the problem by sharpening the shank a bit on the grinding wheel and drilled in 10 minutes. The other 2 bits were ok. All three drills drilled well and were sharp. The bits are marked in mm not SAE but the price doesn't matter as I never look at the markings anyway. Good business.