Feature 1 These burrs are made of tungsten carbide aluminum for high hardness, high abrasion resistance 2 There are a total of 6 burrs in different shapes that you can use for many purposes 3 6mm round shank fits many electric or pneumatic tools 4 Can cut cast iron, cast steel, carbon steel, alloy steel, stainless steel, copper, aluminum, marble, jade, bone, etc. 5 Widely used for carving, shaping and for removing sharp edges or corners, burrs and excess material Features: These burrs are made of tungsten carbide aluminum for high hardness, high abrasion resistance. There are a total of 6 burrs in different shapes that you can use for many purposes. 6mm round shank fits many electric or pneumatic tools. Can cut cast iron, cast steel, carbon steel, alloy steel, stainless steel, copper, aluminum, marble, jade, bone, etc. Widely used for carving, shaping and for removing sharp edges or corners, burrs and excess material. Specifications: Material: Tungsten carbide aluminum Shank diameter: 6mm Cutting diameter: 10mm Head shape: A/D/E/C/L/F Speed: 6000RPM~40000RPM Processing hardness: 85HRA Note: 1, Rotary file in pneumatic or electric tools, the speed is generally 6000-40000RPM, must clamp the tool firmly. 2, The cutting direction should be from right to left even movement, not like the use of grinding stone as reciprocating cutting; be careful not to force too much (pressure is generally not more than 4 kgf). Package includes: 6 x Rotary Burrs