Made of high-quality Material for high hardness, high abrasion resistance. The machining hardness can reach to HRC70. Tungsten Carbide Burr Set, Diameter: 8-10mm, Shank Diameter: 6mm, overall Length: 150-160mm(. 6 inch) Double cut rotating burrs, suitable for fine detail work on cast iron, cast steel, carbon steel, alloy steel, stainless steel, marble, jade, glass, wood and plaster. Widely used for metalwork, tool making, model engineering, wood carving, jewelry making, metal processing, welding, chamfering, casting, deburring, grinding, . 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. 4pcs Tungsten Carbide Rotary File Solid Carbide Rotary Burr Set Drill Grinding Cutter Tools Bits Set with 6 mm Shank and 6 mm Size for DIY Wood-working Carving, Metal Polishing, Engraving, Drilling Features of Rotary Burr Bit: Used with handheld electric or pneumatic tool drive,for Die Grinder, Dremmel Tool or Rotary Drill. Assorted shapes include: Tree shaped radius end, Cylindrical radius end, Ball shape, Taper shape with radius end. Ideal for metal working in mold and pattern making, die sinking, cleaning and maintenance. Shank Diameter: 6mm Cutting Diameter: 6mm Total Length: 150-160mm(6 inch) Colour:As shown Material:Metal Package Contents: 4 * Carbide Rotary Burr Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.