Sturdy and Durable: Chainsaw sharpener made of durable materials made of high quality plastic, it has maximum wear resistance and durability, the chainsaw sharpening tool is installed inside of the rod sharpener to keep the chain and guide rod oiled, reducing friction and extending life. Efficient Sharpening: With sturdy material and superior craftsmanship, the tool saw chain grinder can sharpen the blade easily and quickly with safe operation, saving you a lot of time and energy. Easy to Use: The durable bar mounted sharpener easily and quickly attaches 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 on a solid surface and you'll have sharp, clean edges in seconds. Wide on Applcation: This automatic chainsaw sharpener works great for 14" chain bars. 16/18/20 inch with two guide holes. The two guide pins that secure the bar mounted sharpener ensure perfect alignment between the stone and the cutter. Handy tool to provide an easy and portable method.