BB Step Drill 90 Degree for Steel CNC Precision Solid Carbide Drilling Tools Coated Screw Hole BB2055 Hole Diameter:3.1x6xD6x10x50 Choose between 3-flute and 4-flute

Choose between 3-flute and 4-flute geometry based on your workpiece material

and wider chip breakers

5 D4 8  50  4T 3R1 D4 8  50  4T 4R0

Key Features

BB Step Drill 90 Degree for Steel CNC Precision Solid Carbide Drilling Tools Coated Screw Hole BB2055 Hole Diameter:3.1x6xD6x10x50 Choose between 3-flute and 4-fluteOnce Formed Drilling + Chamfering The blade edge is sharp without burrs, easy chamfering Greatly improves work efficiency. Solid Carbide Bars High Hardness High Wear Resistance A specialized tool for high hardness and high speed cutting applications with higher wear resistance and strength Blade Nano Diamond Coating Aluminum Processing Strong Thermal Insulation Coating Nano Crystal Strong and Tough Base Film Enhance tool hardness and service life,