High Quality Material: The chainsaw sharpener is made of high quality durable plastic + abrasive stone. Heavy Duty Sharpening Stone: The shank mounted sharpening stone is sturdy and durable, lightweight and can be quickly and easily attached to the end of the guide rod. Provides a fast, simple and portable way to sharpen saw chains. Safe and Fast: The portable electric sharpener protects your hands from injury.When using the tool, you don't have to need to touch the inside with your hands, which is very safe. Simply press down on the saw and sharpen the chainsaw in seconds. Sharpen saw chains quickly and easily. Suitable for 14-20 inch chainsaw chains: The chainsaw sharpener is equipped with 2 holes for installing sharpeners. One hole is fixed and the other is adjustable, so it is very flexible to install. Suitable for 14/16/18/20 inch chainsaw chains. Additional sharpening stones: Our chainsaw grinder contains 5 sharpening stones. It is easy to replace the stone. Comes with 2 sharpening stones and spare holders to extend the service life, and you can sharpen the chain quickly and easily.