Cssc109 combination stone, silicone carbide silicon carbide combination bench stones have both coarse and fine grit silicon carbide surfaces. these fast-cutting stones are used to sharpen edges on tools to moderate tolerances quickly. stones are very fast cutting and while a thin clear oil is usually sufficient. these softer stones have several advantages over harder stones. because they are softer, they do not become glazed or loaded with detritus. plus, they are lubricated effectively with water rather than oil, but can be used with either. there are a number of ways to sharpen knives and tools, but water stones are the preferred method, because the user has absolute control during the sharpening process. a two sided combination fine/coarse combination sharpening stone. how to use: soak the whetstone in water for about 5 to 10 minutes or until only a little air bubbles appearing, that indicates the stone have absorbed the optimum amount of water necessary for best result and keep applying water while sharpening. the reason for using the water is, the water make the small stone particles released when sharpening, form an abrasive substance that gives the best sharpening result. place the stone on a slip resistant surface like a wet wiping piece or a wet dishcloth. a sharp knife is predictable. it do not slip when it is drawn over the foods surface. it is easy to control. a sharp knife make a nice clean cut sharpening your own knifes is a basic kitchen skill learn it now. sha