I expected to get a hole saw that would work better than the bi-metal hole saws I had been using on Hardie board and plywood and OSB. In Hardie cement board the carbide tipped hole saw does work better and outlasts the high speed steel teeth of a bi-metal hole saw. With OSB and particle board the carbide teeth provide no improvement over much cheaper bi-metal hole saws and take as much drill power which makes them usable with cord drills only.The seller states that these are good for stainless steel and tile and nothing could be further from the truth. For stainless steel get a carbide tooth hole cutter. For tile get a carbide grit or a diamond hole saw. These Lenox are good for Hardie board and possibly fiberglass but have been terrible on anything else I have used them on.