This electric saw sharpener offers a quick and easy way to sharpen your knives. Press the tip of the sharpener onto 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, depress 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 do not need to touch the stone at sharpen.The chainsaw sharpener is made of high-quality durable plastic and sharpening stones to ensure your safety and quickly restore the working performance of your chainsaw. It is a good helper to improve work efficiency.