These burrs are made of tungsten carbide aluminum for high hardness, high abrasion resistance. There are total 6 pieces burrs in various shapes that you can use for many purposes. 6mm round shank would fit many electric powered or pneumatic powered tools. Could cut cast iron, cast steel, carbon steel, alloy steel, stainless steel, copper, aluminum, marble, jade, bone, etc. Widely used for carving, shaping and for the removal of edges or corners, burrs and excess material. Material: Tungsten carbide aluminum Shank Diameter: 6mm. 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…