The MoreTopGood hole saw kit was ordered to add to my tool box. This set includes 10 different saws and pilot drills, 2 mandrels, an Allen key and a case. That's probably more different sized hole saws than I'll ever need or use. These hole saws seem to have a quality that can be used not only at home but also in the workplace. Bi-metal hole saws should offer about 10 times the life of carbon steel hole saws. I like this quality. Another feature I like is the holes in the hole saw that effectively remove wood chips. This is a feature that my previous hole saws did not have. While this hole saw worked well, it filled up with debris and needed cleaning, causing a small delay. In addition, these hole saws are designed to cut a wide variety of materials, from wood to wall panels to metal and other materials. RESULTS: There may be better hole saws on the market, but for the price, these hole saws are a great buy. I like the quality of the steel in these saws. I would definitely order again.