DMT D10E 10-Inch Dia-Sharp Continuous Diamond Extra Fine Superior diamond sharpening stones Legendary quality Made in the USA Sharpening surface accommodates range of edges :From large knives to small pointed tools Extra Fine diamond to polish and refine a razor edge after sharpening with a coarser diamond stone. Sharpens knives faster than conventional stones with DMT's monocrystalline diamond surface No oil is needed-sharpen dry or with water Durable construction will provide years of consistent performance and reliable service