Convenient and Fast Grinding:The new electric sawtooth grinder offers a quick and easy method for sharpening chain. The chainsaw can clear the dull chain again in just 3-5 seconds. The chainsaw sharpening tool is lightweight and easy to carry, and can be easily used outdoors to protect your hands from injury. Wide Compatibility:This chainsaw sharpener is only suitable for 14""16""18""20", and there are two holes on the outside of the chainsaw blade. There are 2 pins on the electric saw sharpener to fix the electric saw blade. The second pin is adjustable. The distance between these two pins (holes) is about 0.7 to 1.3 inches. Intimate and perfect design:To adapt to different kinds of chains of different holes, the chainsaw sharpener is designed with 2 holes to fix the sharpener, one hole is fixed and the other hole is moved back and forth, which is very flexible. Check beforehand whether the saw blade has two holes. If the saw blade only has one hole, you can remove the sliding rivet which can move back and forth, then install and use it. Easy to install and use:The chainsaw sharpening tool has been installed in the sharpener and can be installed and used at any time, so that you can sharpen your chain in no time. Keep oil on chain and guide rails to reduce friction and extend life.