's Japanese Nagura Surface Grinding Stone, 'IRODORI', offers a range of grits from #220 to #12000 (10 variations), designed to swiftly and easily sharpen your knives when used with your Whetstone. Maintain Wetness: Keep Nagura Stone & Whetstone moist throughout sharpening by sprinkling water, serving as a lubricant Preparation: With Whetstone stationary, rub it evenly with Nagura Stone (back and forth) to generate wet stone powder, leave residue undisturbed Knife Sharpening: Proceed with knife sharpening as usual