Smith's 8" Diamond Tri-Hone offers comes with two interrupted surface diamond stones and a Medium Arkansas stone. The Coarse and Fine grit diamond stones feature a unique, overlapping hole design that speeds sharpening by collecting and holding the metal filings which build up during the sharpening process, thus allowing the stone's surface to remain clean and clear. The Natural Arkansas Stone is best used for finishing your edge. It removes moderate amounts of metal as it polishes the cutting edge. This 3-stone sharpening system is excellent for sharpening pocket knives, hunting & fishing knives, kitchen knives, and tools of all sizes, large or small.