Features Effective File: The complete and uniform distribution of particles allow these files to sharpen stably and effectively. Practical Use: Mainly applied for grinding, mould processing and repairing, engraving, line cutting, welding bur, etc. Broad Utility: Allows for flexible application on 7/32 inch wheel and large chainsaw chain, such as 404, 3/8 inch chain. Easy to Change: Specially designed for electric grinder, only 2 steps are required to complete the changing, very easy. Using: Adopting emery material through Ti electroplating process, the grinding heads has excellent durability. Spec: Item Type: Chainsaw Sharpener Burr Material: Emery Function: Grinding head for saw chain grinder Features: 1. Mainly used for grinding, mould processing and repairing, engraving, line cutting, welding bur, bur and welding. Chamfering and grooves processing of various mechanical parts, pipe cleaning, holes and surface treatment parts. 2. It can be installed on electric grinders, engraving tools, and pneumatic engraving pens. packing list: 20 x Chainsaw Sharpener Burr Notice: There may be many black spots on the surface of the grinding head. It is not that the Ti coating falls off, but the Ti and silicon cemented carbide are mixed for better use. Package List 20 x Chainsaw Sharpener Burr