I use Hozly compression bits exclusively for CNC wood carving of softwood and hardwood. I've never had problems with unexplained or premature failures, tarnishing or burning of parts. When I order a set of bits, I usually do a spot check with calipers to check dimensions and overall appearance. I have always found these bits to be as sharp and true to size as any of the more expensive bits I have used. As a small business, I appreciate the durability and quality of these bits without breaking the bank. I expect to continue buying more strains as my business expands and I hope to see the same results in the future.