【High-Quality Material】 Conical pitch drill bit and titanium. Twist drill bits made of high-speed steel with a titanium coating to reduce friction and heat, more capable and durable. M35 cobalt drill bit set boasts high hardness. 【Dimensions】 Set of 3 step drill bits including three different sizes: 4-12 mm/4-20 mm/4-32 mm, to meet various drilling size needs. 【Anti-slip Design】 The titanium step drill bit set features a groove design, helping the electric drill hold it more securely and preventing slippage or dropping during rotation. 【Efficient Operation】 During drilling, the titanium step drill bit vibrates less than twist drill bits and has a clear scale, offering wide and flexible application for easier work. 【Multifunctional】 These titanium hex drill bits are perfect for cutting holes in a variety of materials, including brass, wood, plastic, and materials with a hardness of over 25 degrees. Easily cuts iron from 1 to 5 mm, aluminum, wood, plastic, carbon steel; durable.