Holds up to 2x longer than a standard HSS M3 hole saw. For cutting sheet metal, you need a hole saw that is robust enough to penetrate hard steel while still making clean and efficient pipe cuts. The PRO Sheet Metal meets all these requirements and is therefore extremely popular among professional metalworkers. We developed the PRO Sheet Metal hole saw for professionals who need to cut metal. The HSS teeth with 8% cobalt are sharp and durable. It has a sturdy body and features a practical ejector spring that allows for easy removal of the drill core. Designed for use with Bosch's Power Change Plus quick-change adapter: for accuracy and durability.