DMT D8C 8-Inch Dia-Sharp Continuous Diamond Coarse Superior Diamond Sharpening Stones Legendary quality Made in the USA Sharpening surface accommodates range of edges from large knives to small pointed tools Coarse diamond to transform a dull edge 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