【Fast and Convenient Sharpening】 The new electric saw-tooth sharpener offers a quick and easy way to sharpen chainsaw chains. A dull chain can be restored in just 3 to 5 seconds. This chainsaw sharpening tool is lightweight and portable, making it ideal for outdoor use and protecting your hands from injury. 【Wide Compatibility】 This chainsaw sharpener is only suitable for 14", 16", 18", and 20" chainsaws, and there are two holes on the outside of the chainsaw blade. There are two pins on the electric saw sharpener to secure the electric saw blade. The second pin is adjustable. The distance between these two pins (holes) is approximately 0.7 to 1.3 inches. 【Intimate and Perfect Design】 To accommodate different types of chains with varying hole patterns, the chainsaw sharpener is designed with two holes for mounting. One hole is fixed, while the other moves back and forth, providing excellent flexibility. First, check if your saw blade has two holes. If your saw blade only has one hole, you can remove the sliding rivet that allows for back-and-forth movement, then install and use the sharpener. 【Easy to Install and Use】 The chainsaw sharpening tool is pre-installed in the sharpener and can be installed and used at any time, so you can sharpen your chain in no time. Keep oil on the chain and guide rails to reduce friction and extend chain life.