The Chain Sharpener provides a fast, simple and portable way to sharpen the chainsaw. The Chain Sharpener Tool gives users the power to sharpen the chain, saving labor time and effort. Attaches to the end of the guide bar when sharpening, easy and convenient to use. The whetstone inserts into inside the bar mounted sharpener. There is a unique incisor stone attachment inside the sharpener, which can help grind your chain.