One set includes 12pcs grinding wheels which are used for polishing and grinding, the grinding head diameter is about 4mmMounted grinding wheels Made of strong and hard alloy, they are hard, durable, can bear long time wear and tear. To sharpen a chainsaw chain, it would be much more desirable to use a file and a support tool to adjust and maintain a constant sharpening angle while removing the same amount of material on each link.Grinding wheels for quick and easy sharpening of chainsaw blades. You can use this type of wheel to sharpen a chainsaw chain, it works well, do not press too hard, do not try to "wear out" the chain, sharpen very regularly, before it really does not cut anything and well respect the angle Think carefully about the direction of rotation in the direction of the "tooth"The uniform distribution of the granularity makes the polishing work simple, the abrasive grains do not come off easily, which prolongs the life of life.Widely applications, mainly used for polishing or modeling on the surface of plastic, metal and wood, or other situations.