High Quality: The chainsaw sharpener is made of high-quality ABS plastic and high wear-resistance whetstone. Please keep the chain and guide rod oiled to reduce friction and help extend the life of the product, so you can keep using this chainsaw sharpener all the time. Safe & Efficient: The chainsaw sharpener provides a simple and fast saw chain sharpening method, only takes 3-5 seconds for your chainsaw to become sharp, greatly increasing productivity and saving time. Easy to Use: Just attach the chainsaw bar on the two holes of the sharpener. Then close and lock the sharpener. Finally, gently squeeze the chainsaw. Suitable for 14/16/18/20 inches of chainsaw chain, except for ECHO 16 inches chainsaw. 4 x Detachable Whetstones: The sharpening stone is detachable and replaceable. If it is loose, re-insert the stone into the black clamps, which is designed to fix the stone, ensuring that the tool can work properly.