Zelcan 12 Sizes Step Drill Bit, Four Spiral Flute Step Bit For Metal, Handle Drilling Tasks with Ease: With four sharp cutting blades, Zelcan's step drill bit ensures swift, smooth drilling, effortlessly cutting through steel, aluminum, copper, and other tough materials like a hot knife through butter! Titanium-Coated HSS Build: Crafted from robust high-speed steel with a titanium coating, our drill bit ensures superior hardness for faster cutting through tough materials while withstanding high temperatures and forces for lasting performance. Versatile 12-Size Drill Bit: Our 12-step drill bit covers a wide range of sizes, including 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", and 7/8", offering the perfect solution for all your drilling needs. Smooth Clean Drilling: Our drill bit's four-spiral flute design enables faster cutting and drilling compared to dual or single flute bits. It also efficiently clears away chips for smooth performance. Easy-Fit Hex Shank: With its 1/4" hex shank and quick-release slot, our metal drill bit ensures compatibility with a wide array of driving tools, providing both secure connections and effortless changes.