The Faithfull Diamond Folding Whetstone is supplied in a handy storage case that unfolds to form a handle. The case protects the diamond stone and allows it to be kept in a pocket ready for use. Quickly restores a sharp edge to any blunt tool. The 400 and 600 grit surfaces are suitable for general purpose sharpening of knives, scissors, cutting blades, carbon steel, HSS and tungsten carbide tools, etc. Can be used dry or with water as a lubricant, no oils are necessary.