【High Quality Material】Titanium Step Drill Bit. 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 has high hardness. 【Dimensions】 3-piece step drill bit set includes three different sizes of 4-12mm/4-20mm/4-32mm, to meet different drilling size needs. 【Anti-slip Design】 The titanium step drill bit set adopts groove design, helps the electric drill hold it more firmly, prevents slipping or falling during rotation. 【Efficient Operation】 In the drilling process, the titanium step drill bit vibrates less than twist drill bits and has a clear scale, wide and flexible application for easier work. 【Multifunctional】 The titanium hex drill bits are perfect for cutting holes in a variety of materials, including brass, wood, plastic and more than 25 degrees of hardness. Easily cuts 1-5mm iron, aluminum, wood, plastic, carbon steel, durable.