- High-Quality Material : Crafted from high-speed steel (HSS) with a titanium coating, our step drill bits offer superior durability and sharpness compared to standard HSS bits. The titanium coating minimizes friction, prolonging the drill's lifespan, making it ideal for sheet metal processing and non-ferrous metals, plastics, and wood. - Product Features : This set includes 5 precision-engineered step drill bits, designed to replace 50 individual drill bits with various hole diameters (including popular sizes such as 3/4, 5/8, 1/2, 7/8, and 1/4 inches). You can complete drilling, reaming, and deburring processes in one motion without switching bits, making it a versatile choice for DIY enthusiasts, handymen, and professionals alike. - Unique 118° X Design : Each drill bit features precision-ground 118° X split grooves for enhanced wear resistance and efficient drilling. The double-edged straight flutes optimize chip evacuation, ensuring faster, off-center angle prevention, and heat treatment for added strength. - Automatic Center Punch Included : Our set comes with an automatic center punch designed to prevent drilling misalignment. With a heavy-duty spring-loaded action, it ensures accurate hole marking on metal and hard surfaces, providing a reliable guide for cone drill bits. - Use Scenarios : Perfect for fabricating metal sheets, creating custom wooden furniture, or performing mechanical repairs. Whether you're a hobbyist or a professional, these drill bits cater to a wide range of applications, delivering precision and reliability every time.