Crafted from premium high speed steel, this hexagonal shank step drill bit set delivers superior wear resistance and hardness, ensuring long last sharpness for efficient drilling through tough materials The versatile 3piece/set includes multiple sizes (4-12mm,3-12mm,4-20mm) of step drill bits, designed with a step shape to jamming and provide smooth, precise holes in metal, wood, and These multisize drill bit are easy to use with handheld or bench drills, enhancing user comfort and reducing fatigue during extended use Perfect for home improvement tasks, craft projects, and repair work, these hexagonal shank drill bits enable accurate drilling in various settings like workshops or garages Ideal for woodworkers, metal fabricators, and enthusiasts, this step drill set caters to both professional tradespeople and home hobbyists seeking reliability tool, Manufacturer: HUAJINGKEJI