Smiths Dual Grit Combination Sharpening Stone features synthetic abrasive material construction for premium-caliber performance youd find on a diamond sharpener or natural bench stone sharpener, at an unprecedented value. The extra-coarse side (100 grit) delivers aggressive removal of metal and will sharpen a dull or damaged blade surprisingly quickly. The other side (240 grit) offers less aggressive removal of metal and works wonders for sharpening somewhat dull blades that just need a quick touchup, or for smoothing the cutting edge after sharpening on the extra-coarse side. The Smiths Dual Grit Combination Sharpening Stone makes an excellent solution for pocket knives, sport knives, tactical knives, or other cutting tools. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Sharpeners.