You’ll never work with a dull chainsaw chain again. The PowerSharp system consists of a chain, a bar and a bar-mount sharpener. When the chain gets dulled, sharpening is as easy as putting the sharpener on the blade and pressing the tip of the sharpener into a solid surface for a few seconds, bringing the unique top-cutting cutters into contact with the sharpening stone. This sharpens the chain and resurfaces the stone. For use with 3/8″ low profile bar only