As a hesitant buyer, I was skeptical about this hole saw .But as my tests showed, it`s a real game-changer. The carbide grit provides fantastic cutting performance and the black coating adds a layer of durability. It's also great that it fits onto a range OF accessories. Nonetheless the price is a bit steep and could be a concern for industrial users. Overall, this is a great purchase for anyone who is looking for a reliable cutting tool in the Industrial and Scientific category..