Based on my observations, this hole saw is a complete waste of money. Despite being marketed as an industrial and scientific-grade tool, it failed to deliver. I had to apply a lot of force to cut through thin metal, making it very difficult to use. Plus, the teeth quickly lost their sharpness after just a few uses. The only positive thing I can say is that the saw comes with an adapter, but that's hardly worth the investment. Overall, I wouldn't recommend this product to anyone.