The bi-metal hole saw produces smooth cuts in various materials. The tooth geometry (Vario tooth design) is ideally suited to glide through the material and create smooth cuts. This hole saw is made of bi-metal HSS (high-speed steel) with an 8% cobalt alloy, which reduces the risk of tooth breakage and provides higher heat resistance for long-lasting cutting performance. This hole saw is suitable for cutting wood, metal, and plastic.