5pcs tungsten carbide burrs are double head, for electric or pneumatic tool drive (also can be used in machine tool). Features: For electric or pneumatic tool drive (also can be used in machine tool). The speed of electric or pneumatic tools is generally 6000-50000 rpm, suitable for deburring and polishing cast iron, cutting, engraving, cast steel, carbon steel, alloy steel, stainless steel and other materials. The machining hardness reaches HRC70, for most work, the rotary burr set can replace the small Petiole wheel. And their life is 10 times longer than normal HSS bur, 200 times longer than small Petiole wheel. The double-cut style has rows of cutting teeth cut in two intersecting directions for fast stock removal and a rougher finish. Tungsten carbide is about twice as stiff as steel, with a Young's modulus of about 530 to 700 GPa (77,000 to 102,000 ksi), and is twice the density of steel, almost halfway between that of lead and gold. It is comparable to corundum (-Al2O3) in hardness. They all feature hardened and tempered steel shanks that provide strength. This stops bending and reduces vibration for improved tool life. Specifications: Material: Tungsten Carbide Color: Silver Groove: Solid Double Cut Cutting Margin Diameter: 6/8/10/12/14mm Shank Diameter: 6mm/0.24in Total Length: 60-65mm/2.36-2.56in Package Weight: 190g/6.7oz Package Size: 100*72*19mm/3.94*2.83*0.75in Packing List: 5 * Milling Cutters