Wet stone Kombo 1000/3000 Grit from Satake is a whetstone that sharpens the knife. This combination stone is perfect for optimal knife sharpening, with 1000 grit on one side and 3000 grit on the other. Whetstones are graded according to different grits, or levels of fineness, depending on the purpose of the grinding. Satake sharpening stones are color coded for easy identification of the grit level.