3pcs HSS Step Drill Straight Grooved Core Cone With Center Punch Bits1/4 Hex Shank 3mm to 12mm 4mm To 12mm 20mm Chamfer Hole Cut Cutter
Highlights What is Step Drill Bit · Step drill bits can be used with metal and wood. · Useful for drilling pilot holes in woodworking and sheet metal-based projects. · Allows drilling holes of multiple sizes with same drill bit; can be used to clean away waste material in holes. What does titanium coating do? Titanium nitride (TiN) coating is wear resistant, inert and reduces friction . Use it on cutting tools, punches, dies and injection mold components to improve tool life two to ten times, or more, over uncoated tools.