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 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. Quick Sharpening: The chainsaw sharpener gives you a simple, fast and efficient way to sharpen your knives. It sharpens dull chainsaws quickly, saving time and increasing productivity. 6 Whetstones: The chainsaw sharpener comes with 6 replaceable whetstones. This chainsaw sharpener is suitable for shank sharpeners and saw blades to sharpen for optimum cutting performance.