[Rugged and Durable]: These chainsaw sharpener burrs are made of quality emery grain and metal shaft handle, which with effective grinding effect, hard texture and durable to use for long time. There are full and evenly distributed particles on the chainsaw bits to the chain saw chain can be sharpen steadily and efficiently. [Practicability]: These burr grinding stone files leave an excellent on saw chain and are easily replaced on most electric chain sharpeners. Perfect for sharpening chain saw teeth. and there is no need to the chain when using it, completely rid of the trouble caused by using files. Effectively improving work efficiency. [Wide Application]: 5/32 inch polished drill bits are suitable for small 3/8 inch and 1/4 inch chainsaw chains. These polishing grinding tools are widely applied for machinery, bearing, metal polishing, chain saw, , jade, wood, welding spot, welding seam grinding, burr grinding, etc. [Detail Size]: Total length .:1- 6/8 inch(45 mm); Grinding head Length .:7/8 inch(22 mm) ; Grinding head Diameter .: 5/32 Inch(4mm); Shank Diameter .: 1/8inch(3mm); [Note]: If there are black spots on the surface of the wheel. It's not that the titanium coating has fallen off, but just a mixture of titanium and silicon carbide. No need to worry about usage problems, it can be used safely and normally. colour: as shown Material: emery Size: 4.0mm Package Contents: 12 x Burr Grinding Stone Files Only the above package content, other products are not included. Note: Light 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.