" Convenient and fast sharpening: The new chain sawtooth sharpener provides a quick and easy way to sharpen the chain. The chainsaw can clean the dull chain again in 3-5 seconds. The tool chain saw sharpener is lightweight, easy to carry, easy to use outdoors, and protect your hands from injury. High Quality Materials: This lightweight and durable chain saw blade is made of high quality ABS, which is suitable for most 14""""/16""""/18""" chains "/20"""" in the market. (Note: not compatible with ECHO 16 chainsaws) Intimate and perfect design: In order to adapt to different types of hole chains, the chainsaw sharpener is designed with 2 fixed grinding holes, one fixed and one hole for moving forward backward. If your saw blade has only one hole, you can slide it back and forth. The rivets are removed then installed and used. Easy to Use: Just attach the clamp to the shank, position the ratchet over the tooth, insert the cutter into the hole of the chainsaw sharpener, then gently twist the handle. Keep oil on chains and rails to reduce friction and extend life. "