Anself 400/1000 Grit Double Side Diamond Whetstone Knife Sharpener Sharpening Stone Grindstone 100301.2mm Lightweight, small and thin in size, portable and anti-friction. Easy and convenient to sharpen knives, more effective for you. Sharpens knives faster than conventional stones with the diamond surface. Double-sided sharpening design(400# for coarse grinding and 1000# for fine grinding). For sharpening knives, scissors, shave knife, cutting tools, etc.