A convenient combination of a medium grit Crystolon, fast-sharpening, silicon carbide abrasive, side and fine grit India, smooth cutting aluminum oxide abrasive side An excellent economical solution for general sharpening and finishing with one stone Using these stones with oil enhances the sharpening action and minimizes the clogging of the stones' surface Ideal for hand dimensioning and sharpening of all types of knives, plane blades, chisels, scrapers, or any other tool that needs a flat, sharp edge