General description The 3PCS Countersink Drill Bit set features triangular tapered titanium countersink drill bits made from high-speed steel with a titanium coating. This design reduces friction and heat, enhancing durability and performance. The set includes three different sizes: 4-12mm, 4-20mm, and 4-32mm, catering to various drilling needs. Technical specifications Material: High-speed steel with titanium coating Sizes: 4-12mm, 4-20mm, 4-32mm Thickness capacity: Easily cuts through materials up to 1-5mm thick Other information Non-slip groove design for better grip Vibrates less than traditional twist drills Suitable for drilling in steel, brass, wood, plastic, and carbon steel