DMT, 8" Dia-Sharp Continuous Diamond Bench Stone, Extra Fine Sharpening surface accommodates range of edges. From large knives to small pointed tools Extra Fine diamond to polish to the finest edge- 9 micron / 1200 mesh Sharpens knives faster than conventional stones with DMT's monocrystalline diamond surface No oil is needed-sharpen with soapy water Durable construction will provide years of consistent performance and reliable service