2/4/5mm Groove Step Drill Bit Metal Wood Aluminum Plate High Speed Steel Hole Cutter Core Drilling Taper Tool KitFeature: Made of high quality HSS steelIt is very suitable for cutting holes in various materials, including steel, aluminum plate, wood, plastic, etc. 3-sided chuck design to prevent sliding when clamping Two flutes design drives faster, smoother and cleaner cutting, and each step is clearly marked with the depth of the step diameterIt is suitable for operations with a hardness of less than 23 degrees. It can process iron plates, aluminum plates, 4mm wood plates and 5mm plastic with a thickness of 2mm. Specification: Material: High Speed SteelBlade Diameter: 4-22mmBlade Length: 50mmTotal Length: 80mm Handle Diameter: 6.35mmNote: Due to the different monitor and light effect, the actual color of the item may be slightly different from the color showed on the pictures. Please allow 1-2cm measuring deviation due to manual measurement.1 x Step Drill Bit