Multi-Size Versatility: This step drill bit includes nine precise sizes from 1/4 to 3/4 inch(1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4 inch) to handle diverse drilling needs. Minimal bit changes help maintain an efficient workflow across projects Long-Lasting Sharpness: The step bit is made of cobalt high-speed steel with an AlTiN coating to withstand wear and stay sharp. It is ideal for stainless steel, metal sheets, and other tough materials Optimized Cutting Angle: Our step drill bit for metal features a 118° tip and four-flute design, ensuring fast chip clearing, less heat buildup, and clean, burr-free holes in wood, plastic, and fiberglass Universal Quick-Change Shank: Hex shank design fits almost all standard drills for quick, secure bit changes