Feature:1. Multi Purpose:Extended tungsten steel grinding head is ideal for fine detailing, cutting, carving, retouching and more.2. High Hardness: Lengthened tungsten steel grinding head is made of tungsten steel, and the hardness of the grinding head reaches HRC70.3. Applicable Tools: Tungsten steel grinding head is usually used with hand held, electric or pneumatic tool drivers (can also be used in machine tools).4. Easy to Replace: Porting tools can replace old broken grinding heads, the maximum cutting diameter is 8mm, 10mm.5. Wide Application: The grinding head set is suitable for grinding and polishing cast iron, carbon steel, alloy steel, stainless steel and other materials.Specification:Item Type: Rotating BurrMaterial: Tungsten SteelColor: SilverShank Type: 6mm Round ShankMaximum Cutting Diameter:Approx. 8mm / 0.3in,Approx. 10mm / 0.4inGrinding Head Hardness: HRC70Product Length:Approx. 150mm10mm / 5.9in0.4in(the Length is within This Range)Applicable Scene: Hand Held Electric or Pneumatic Tools (can Also Be Used in Machine Tools).Package List:4 x Rotating Burr 4 x Storage BoxNote:Please bring protective equipment when using it.