Robust and Durable: Chainsaw sharpener made of high quality durable plastic materials, it has maximum wear resistance and durability, the chainsaw sharpening tool is installed inside the shank sharpener to keep the chain and the guide rod oils, reducing friction and extending service life. Efficient sharpening: With sturdy material and superior craftsmanship, the saw chain grinding tool can sharpen the blade easily and quickly with safe operation, saving you a lot of time and energy. Easy Use : Durable bar-mounted sharpener attaches easily and quickly to the end of the guide bar. Simply attach the bar mount sharpener to the guide bar. Twin guide holes at the top of the bar ensure perfect alignment. Press the tip of the sharpener onto a solid surface and you'll get crisp, clean edges in seconds. Wide Application: This automatic chainsaw sharpener works great for 14/16/18/20 inch chain bars with two guide holes. The two guide pins that attach the bar-mounted sharpener ensure perfect alignment between the stone and the cutter. Handy tool to provide a simple and portable method.