Features: _x000D_These burrs are made of tungsten carbide aluminum for high hardness, high abrasion resistance._x000D__x000D_There are total 6 pieces burrs in various shapes that you can use for many purposes. _x000D_6mm round shank would fit many electric powered or pneumatic powered tools._x000D__x000D_Could cut cast iron, cast steel, carbon steel, alloy steel, stainless steel, copper, aluminum, marble, jade, bone, etc._x000D__x000D_Widely used for carving, shaping and for the removal of sharp edges or corners, burrs and excess material. _x000D__x000D__x000D_Specifications: _x000D_Material: Tungsten carbide aluminum_x000D_Shank Diameter: 6mm _x000D_Cutting Diameter: 10mm _x000D_Head Shape: A/D/E/C/L/F _x000D_Speed: 6000RPM~40000RPM _x000D_Processing Hardness: 85HRA _x000D__x000D__x000D_Note: _x000D_1, Rotary file in pneumatic or electric tools, the speed is generally 6000-40000RPM, must clamp the tool firmly. _x000D_2, Cutting direction should be from right to left uniform movement, not like the use of grinding wheel as reciprocating cutting; be careful not to force too much (the pressure is generally not more than 4 kgf). _x000D__x000D__x000D_Package Includes: _x000D_6 x Rotary Burrs 1These burrs are made of tungsten carbide aluminum for high hardness, high abrasion resistance 2There are total 6 pieces burrs in various shapes that you can use for many purposes 36mm round shank would fit many electric powered or pneumatic powered tools 4Could cut cast iron, cast steel, carbon steel, alloy steel, stainless steel, copper, aluminum, marble, jade, bone, etc 5Widely used for carving, shaping and for the removal of sharp edges or corners, burrs and excess material