Smooth Cut Bi-Metal Hole Saw for smooth cuts in various materials. The tooth geometry (Vario-tooth design) is ideal for achieving smooth cuts through the material. Made from bi-metal HSS with an 8% cobalt alloy for long-lasting cutting performance. The bi-metal hole saw fits all standard adapters available on the market. This hole saw produces smooth cuts in various materials. It is made from bi-metal HSS (high-speed steel) with an 8% cobalt alloy, reducing the risk of tooth breakage and providing higher heat resistance for prolonged cutting. This hole saw is suitable for cutting wood, metal, and plastic.