Excellent Material: The saw chain sharpener is made of high quality plastic, sturdy and durable. Chainsaw sharpening tools are installed in the sharpener to keep the chain and guide rods lubricated, reducing friction and increasing service life Universal: The chainsaw sharpener fits most 14"/16"/18"/20" chainsaws on the market. (Note: Not compatible with ECHO 16 chainsaws) Easy to Use: Open the sharpener, install the chainsaw on the two holes, close the sharpener. When sharpening the knife, gently push the end of the guide bar until the saw touches the sharpening stone Fast Sharpening: The chainsaw sharpener provides you with a simple, fast and effective way to sharpen your knives. It quickly sharpens dull chainsaws, saving time and increasing productivity 6 Sharpening Stones: The chainsaw sharpener comes with 6 replaceable sharpening stones. This chainsaw sharpener is suitable for tail sharpeners and saw blades to sharpen optimal cutting performance