Features: 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 prevent jamming and provide smooth, precise holes in metal, wood, and plastic. Ideal for woodworkers, metal fabricators, and enthusiasts, this step drill set caters to both professional tradespeople and home hobbyists seeking reliability tool performances. 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. These multisize drill bit are easy to use with handheld or bench drills, enhancing user comfort and reducing fatigue during extended use. Specifications: Component: High Speed Steel Quantity: 3pieces/set Length: 67mm/2.63inch(4-12mm),78mm/3.07inch(3-12mm),75mm/2.95inch(4-20mm) hexagonal Shank; Usage scenario:Home Improvement,Woodworking,Metal Processing,Projects; Package Includes: 1set/3pcs Step Drill Bit note: Please allow 1-3cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.