- Versatile Multi-Size Step Drill Bit: This HSS hexagon titanium-coated step drill bit ranges from 4 mm to 22 mm, allowing you to drill precise holes in various sizes: 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, and 22 mm. - Reliable and Durable Design: Engineered with a unique structure that eliminates the need for a center punch, this drill bit enhances durability and reliability, making it ideal for extended use. - Efficient Hole Processing: This drill bit features deburring, chamfering, and enlarging capabilities, which makes it suitable for processing thin iron sheets, aluminum insulation panels, and PVC sheets with a thickness of up to 5 mm. - High-Quality Material: Made from high-speed steel with a titanium treatment, this drill bit ensures exceptional longevity and superior drilling performance, even in demanding applications. Use Scenarios: - Perfect for DIY enthusiasts and professionals working on metal fabrication or electrical installations where precise hole sizes are essential. - Ideal for home improvement projects, such as installing fixtures or creating access points in thin materials. - Suitable for automotive applications where drilling into various substrates is required without compromising integrity. This step drill bit combines functionality and durability, making it a must-have tool for anyone looking to achieve clean, accurate holes in a variety of materials.