Material: Tungsten Carbide, Shank diameter: 3 mm(1/8 inch), Cutting edge diameter: 6 mm(1/4 inch), Total length: 50 mm(2 inch).Please check the size before you buy it. Double cut head. Suitable for deburring and polishing cast iron, cast steel, carbon steel, alloy steel, stainless steel and other materials. Excellent for fine detail work, cutting, engraving, carving, touch-up and finishing. Processing all kinds of metal(including all sorts of hardened steel) and non-metal (such as marble, jade, bone), and the machining hardness can reach to HRC70. Generally use with handheld electric or pneumatic tool drive (can also be used in machine tool). The speed of the electric or pneumatic tools usually is 6000-50000 revolutions per minute.