Smooth Cut - The bi-metal hole saw produces smooth cuts in various materials. The tooth geometry (Vario tooth design) is ideally suited for gliding through the material and creating smooth cuts. This hole saw is made of bi-metal HSS (high-speed steel) with an 8% cobalt alloy, resulting in a lower risk of tooth breakage and higher heat resistance for long-lasting cutting performance. This hole saw is suitable for cutting wood, metal, and plastic. The bi-metal hole saw fits all standard adapters on the market. Compatible with standard threaded adapters.