
Step Drill Size: 6-60mm (12 steps: 6,10,15,20,25,30,35,40,45,50,55,60mm). Shank Diameter: 13mm. Application: The step is suitable for parts with high hardness. less than 25°, such as carbon steel, sheet metal, insulation board, PVC board, board and wood. The workpiece thickness is less than 5mm. Note: Use water cooling when drilling to extend the life of the drill. Recommended drilling speed 250-400rpm. Spiral Grooved Slot: Spiral Grooved Tip: Split tip and twist design Double groove for self-centering and deburring, spiral groove helps deburring. Remove chips when drilling.