Make your sharpening stone flat again with this diamond sharpening stone. Sharpening stones with marks or an irregular surface will not sharpen your tool properly. With this stone leveler you can easily and quickly get your sharpening stone back into optimal condition. Place the stone leveler flat on the support plate for your sharpening stone, turn on the machine and move the stone leveler slowly from left to right over the stone. Don't use force, let the stone leveler do the work. Make sure you have dust extraction.