[Detail]: There are complete and evenly distributed particles on the chainsaw bits, it can sharpen the chain saw chain steadily and efficiently. [Premium quality]: burr grinding stone file is made of high quality material with good hardness, adopted titanium plating process, durable and not easy to get broken, you will enjoy 30% lifetime of these bits than others non-titanium-plated. [Easy to operate]: These bits are specially designed for Electric Chainsaw Sharpener. you can apply it to polish without disassembling the chain, which reduces the number of you have to replace it. Effectively improving work efficiency. [Application occasions]:3/16 inch wheels for 325 inch chain, big 3/8 chainsaw chain. These polishing grinding are widely applied for machinery, bearing, mold, casting parts deep hole, different internal surface, welding spot, welding seam grinding and burr grinding. [Tips]: If there are black spots on the surface of the . 's just a mixture of titanium and silicon carbide. No need to worry about usage problems, it can be used safely and normally. colour:Golden Material:Emery size:4.8mm Package Contents: 10 x Burr grinding stone file Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.