High Quality MaterialTitanium Taper Pitch Drill. Twist drill bits made of high speed steel with titanium coating to reduce friction and heat, more capable and durable. M35 Cobalt Drill Bit Set owns high hardness. Dimensions 3 step drill bit set which includes three different sizes of 4-12mm/4-20mm/4-32mm, to meet the different drilling size needs. Non-slip designTitanium step drill bit set adopts groove design, helps the electric drill to hold it more firmly, avoid slipping or falling while rotating . Efficient OperationIn the drilling process, the titanium step drill vibrates less than twist drills, and has a clear scale, wide and flexible application for easier work. Multi-FunctionTitanium hex drill bits are great for cutting holes in a variety of materials, including brass, wood, plastic, and over 25 degrees of hardness. Easily cuts 1-5mm iron, aluminum, wood, plastic, carbon steel, durable.