Feature 1Effective File: The complete and uniform distribution of particles allow these files to sharpen stably and effectively. 2Practical Use: Mainly applied for grinding, mould processing and repairing, engraving, line cutting, welding bur, etc. 3Broad Utility: Allows for flexible application on 7/32 inch wheel and large chainsaw chain, such as 404, 3/8 inch chain. 4Easy to Change: Specially designed for electric grinder, only 2 steps are required to complete the changing, very easy. 5Durable Using: Adopting emery material through Ti electroplating process, the grinding heads has excellent durability.SpecificationItem Type: Chainsaw Sharpener BurrMaterial: EmeryFunction: Grinding head for saw chain grinderFeatures: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. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List20 x Chainsaw Sharpener BurrNoteThere 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.