I recently purchased a Bi-Metal Hole Saw for my cutting tool collection and I couldn't be happier. It's industrial and scientific grade, which really shows through in the quality of cuts it produces .After I put it to the test on some stainless steel pipes, I was blown away by how smooth and precise the holes were. The best part is that it's made from both aluminum and stainless steel, which means it's built to last and won't wear down as quickly as other hole saws. The only downside is that its a bit more expensive than some other options out there, but the quality of the product definitely makes it worth the investment..