Quickly sharpen trimming knives with the Norton Crystolon Tradesman's Utility Stone. Made with a sharp silicon carbide abrasive, these stones remove stock and shape edges fast. Use the medium grit stones for general purpose sharpening and the dual grit coarse/fine stones for more versatility. These stones are available with or without a wooden handle and can also be used as abrasive files in many industries and for a variety of applications.