EFFICIENT SHARPENERThis electric saw sharpener offers a quick and easy way to sharpen the knife. Press the tip of the sharpener onto a firm surface and you'll get a sharp edge in seconds. . CUSTOM DESIGNIt is suitable for 14/16/18/20 inch chain saws, the saw chain blade has 1-2 holes and there are 2 pins on the saw sharpener (l one of the spindles is removable) for fixing the electric saw blade. . GOOD SHRINKING PERFORMANCEThe bottom of the electric saw sharpener is made of high quality stainless steel springs. If the electric saw is inserted into the sharpener, but the size of the electric saw is not large enough to touch the sharpening stone, please press the spring. The spring makes the sharpener suitable for more chainsaw sizes. . HIGH QUALITY The chainsaw sharpener is made of high quality durable plastic and sharpening stones to ensure your safety and quickly restore the working performance of the chainsaw. It is a good helper to improve work efficiency. .