- Premium Quality Material: Crafted from durable high-speed steel, this drill bit ensures exceptional strength and longevity, providing reliable performance for a wide range of drilling tasks. - Dual Helix Spiral Design: Features a two-fluted spiral groove that allows for faster, more stable, and smoother cuts. This design automatically deburrs the hole, keeping the drill bit clean and efficient. - Multiple Sizes: Available in sizes ranging from 4 mm to 22 mm, this set enables you to create various hole diameters with a single drill bit, saving you time and effort by eliminating the need to constantly switch bits. - Versatile Applications: This step drill bit is ideal for drilling through hard metals like stainless steel, steel, and cast iron, as well as softer materials such as wood, aluminum alloys, and other non-ferrous metals. Adjust the speed as needed for optimal penetration. Use Scenarios: 1. Perfect for metalworking shops where precision drilling is required for fabricating components. 2. Ideal for DIY enthusiasts tackling home improvement projects that involve various materials. 3. Suitable for professionals in construction and plumbing, needing to drill multiple hole sizes efficiently.