Manual chain grinding tool, optimized shape, more precise guide, helps improve the working efficiency of the chainsaw. Optimized shape for a more precise guide, helps improve the working efficiency of the chainsaw. Grinding any chain quickly and easily can make your saw chain sharper and easier to use. Simply manually rubbing forward and backward will make your chain smooth and shiny again. A practical tool for sharpening teeth and measuring depth in one step. Suitable for all sizes of chainsaw.