This electric saw sharpener offers a quick and easy way to sharpen your knives. Press the sharpener tip to a solid surface and get a razor sharp edge in seconds. Compatible with 14/16/18/20 inch chainsaws, the saw chain blade has 1-2 holes and it There are 2 pins on the saw sharpener (one pin is detachable) to fix the chainsaw blade. The bottom of the electric saw sharpener is made of high quality stainless steel springs. If you insert the chainsaw into the sharpener but the saw is not large enough to touch the sharpening stone, press down on the spring. The spring allows the sharpener to work with more sizes of chainsaws. The sharpener is lightweight and small in size, easy to carry and use outdoors, your hands don't need to touch the stone to sharpen.The chainsaw sharpener is made of high quality durable plastic and whetstones to ensure your safety and quickly restore your chainsaw's working performance. It is a good helper to improve work efficiency.