General description The CSPARKV 3Pcs Step Drill Bit set includes three high-quality HSS countersink drill bits with titanium coating, designed for versatility and durability. The sizes included are 4-12mm, 4-20mm, and 4-32mm, making them suitable for various drilling tasks in materials such as aluminum, wood, thin iron, PVC, and plastic boards. The universal 6.3mm hexagonal shank diameter ensures compatibility with a wide range of drilling machines. Technical specifications Sizes: 4-12mm, 4-20mm, 4-32mm Shank diameter: 6.3mm (hexagonal) Material: High-quality steel with titanium coating Tip design: 118° for multi-angle drilling Usage Suitable for drilling and reaming in various materials Recommended to use water or cutting fluid to maintain low temperature during operation Clean the drill bits after use to prevent corrosion