Whetstone 1.Finer grits 2.Eco-friendly 3, Long life, durability 4. Various sizes and grits Product name: Sharpening stone/whetstone/grinding stone/oil stone/abrasive stone Materials:White Aluminium Oxide,Black Silicon Carbide,Green Silicon Carbide Size: 180x60x28mm, 200x50x25mm, 150x50x25mmAvailabe grits: #240/#800, #600/#1500, #1000/#4000, #1000/#6000, #2000/#5000,#3000/#8000#180/#320, #400/# ...