High Hardness Material: These burrs are made of tungsten carbide steel for high hardness and high abrasion resistance. Different Shapes: There are a total of 10 pieces of burrs in different shapes that you can use for multiple purposes. Easy to Use: 3mm round shank is suitable for many power or air tools. Suitable for: Could cut cast iron, cast steel, carbon steel, alloy steel, stainless steel, copper, aluminum, marble, jade, bone, etc. Widely Used: Widely used for carving, shaping and for removing sharp edges or corners, burrs and excess material. Product Description Description: This is a set of 10-piece rotary cutters in various shapes for multiple purposes, and can be used to cut cast iron, cast iron, carbon steel, aluminum, etc. alloy steel, stainless steel, copper, aluminum, jade, etc. . Features: Material: Tungsten Carbide Steel Type: Double Cut, Single Cut (Optional) Diameter of shank: 3mm Cutting head diameter: 6mm Speed: 1000~3700R/min Handling hardness: 85HRA Note: Rotary file in pneumatic or electric tools, the speed is usually 1000~3700R/min, must clamp the tool tightly. Package includes: 10 x Rotary Burrs