Robust 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 the rod sharpener to keep the chain and the guide rod oils, reducing friction and extending 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 lots 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 onto a solid surface and you'll have sharp, clean edges in seconds. Wide on Applcation: This automatic chainsaw sharpener works great for 14/16/18/20 inch chain bars with two guide holes. The two guide pins that secure the bar mounted sharpener ensure perfect alignment between the stone and the bit. Handy tool to provide a simple and portable method.