"For electric or pneumatic tool drive (can also be used in machine tool)The speed of the electric or pneumatic tools usually is 6000-50000 revolutions per minute,Suitable for deburring and polishing cast iron,cutting,engraving carving,cast steel,carbon steel,alloy steel,stainless steel and other materials Machining hardness reach HRA.89,For the most work,rotary burr set it can replace Petiole small wheel.And their working life is 10 times longer than normal HSS Burr, 200 times longer than Petiole small wheel. Different between Single-Flute Head and Double-Flutes Head: Single-Flute Head:Double-cut style design to reduce bit stress,betterthan double flutes desgin in cutting hard material. Double-Flute Head ：Double-Flute Head style has rows of cutting teeth cut in two intersecting directions for fast material removal and a rougher finish The Solid Carbide Rotary Burr Set contains 20pcs rotary burrs. They all feature toughened and hardened steel shanks that provide rigidity and strength. This prevents bending and reduces vibrations for an improved tool life. Specification: Material: Tungsten Carbide Groove:Double Cut Solid（10pcs）& Single Cut Solid（10pcs） Cutting edge diameter: 3mm Shank diameter: 3mm Total length:40mm Features & Benefits -Double Cut -First choice for general machining -Improves ease of control -Increases metal removal rate -Breaks swarf into small manageable pieces -Aluminium Cut -First choice for non ferrous materials and plastics -High helix and large flute volume for rapid metal removal Packge Included: 10/20pcs Carbide Rotary Tool"