The 8" Dual Grit Commination Stone features two sharpening stones in one. These sharpening stones are made from a synthetic abrasive material and are used in the same manner as a diamond or natural bench stone. The extra-coarse side of the stone (100 grit) is used for aggressive removal of metal and will sharpen a dull or damaged blade very quickly. The other side of the stone (240 grit) is for less aggressive removal of metal and should be used for sharpening somewhat dull blades that just need a quick touch-up or for smoothing the cutting edge after sharpening on the extra-coarse side. It is excellent for use on pocket knives, sports knives, tactical knives, or other cutting tools. FeaturesDUAL GRITS - This Smith's Dual Grit Combination Sharpening Stone features two separate grits on one great stone. One side of the stone features 100 Grit, while the other side is 240 Grit.VERSATILE - This Smith's sharpening stone will sharpen a variety of straight-edge knives & tools. This combin...