Handle coated with titanium, reducing friction and heat Made of high speed steel, hard, wear resistant and durable Unique step structure can open different hole sizes Compared with ordinary twist drill bit, not easy to break Ideal for drilling holes in a variety of materials including steel, bronze, aluminum and more Description: The spiral groove cone drill bit is made from high quality high speed steel with titanium coating to reduce friction and heat, which is used to cut thin iron plate, aluminum material, plate insulation, a PVC plate and more. The unique step structure allows opening different sizes of holes. Specifications: Material: HSS4241 + cobalt Surface treatment: titanium plating Handle shape: hexagonal Handle Diameter: Approx. 6.35mm/0.25inch Features: 1. Made of high speed steel, hard, wear resistant and durable. 2. Titanium coated handle, reducing friction and heat. 3. The unique step structure allows opening different sizes of holes. 4. Compared with ordinary twist drill bit, not easy to break. 5. Ideal for drilling holes in a variety of materials including steel, bronze, aluminum and more.