Based on my experience as an industrial and scientific tool user, the Stone Tools ST 59 Variable Bi Metal is a reliable and impressive hole saw. It cuts through metal sheets and pipes with ease, leaving clean and precise holes. The variable speed setting is a great feature that allows me to adjust the speed according to the material I'm cutting. The only downside is that it might be a bit pricey compared to other options in the market .OVERALL a great investment for those in need of a powerful…