3 Sizes Head Diameter: 5/32inch (4.0mm), 3/16inch (4.8mm), 7/32inch (5.5mm). 15 pieces of each size; Diameter: 3mm, Overall Length: 1.77inch . Different sizes meet your different needs.There are complete and evenly distributed particles on the chainsaw bits, it can sharpen the chain saw chain steadily and efficiently.Burr grinding stone file is made of high quality material with good hardness, adopted titanium plating process, durable and not easy to get broken.Easy to operate, You can apply it to polish without disassembling the chain, which reduces the number of times you have to replace it. Effectively improving work efficiency.These polishing grinding tools 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 wheel. That's just a mixture of titanium and silicon carbide. No need to worry about usage problems, it can be used safely and normally.Colour:goldMaterial:EmeryPackage Contents:45 x Diamond Chainsaw SharpenerOnly 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.