【High Quality Material】Titanium and tapered 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 has high hardness. 【Dimensions】 3-piece step drill bit set which 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 step drill Titanium drill bits vibrate less than twist drills and have a clear scale, wide and flexible application for easier work. 【Multifunctional】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.