General description 3PCS Step Drill Bit set includes three different sizes: 4-12mm, 4-20mm, and 4-32mm, designed for efficient drilling in various materials such as steel, brass, wood, and plastic. Made from high-speed steel with a titanium coating, these bits reduce friction and heat, enhancing durability and performance. Technical specifications Material: High-speed steel with titanium coating Sizes: 4-12mm, 4-20mm, 4-32mm Suitable for drilling in materials with hardness greater than 25 degrees Other information Anti-slip groove design for better grip during drilling Vibrates less than traditional twist drill bits for smoother operation Easily cuts through 1-5mm iron, aluminum, wood, plastic, and carbon steel