VIP Home Essentials Fine/Grain Combination Knife Sharpening Stone - Dual Grit Sided The coarse 240 grit lighter side is for final honing or touchups and the rough 150 grit dark side is for basic sharpening, removing nicks etc. Sharpens stainless steel, carbon steel and much more. 1 -inch thick Sharpens stainless steel, carbon steel and much more cellent for a variety of knives and tools. Ideal size and convenient for counter tops or bench work. Easy-to-grip, shape provides for safe, simple tool sharpening.