This hole cutter is supposed to be industrial and scientific grade, but it couldn't even cut through a piece of cardboard without tearing it. As my tests showed, the carbide tips were dull and the stainless steel material was flimsy. The only pro was that it arrived on time, but that doesn't make up for the disappointment of spending so much money on a useless tool. Save yourself time and money and look elsewhere for a reliable hole saw.