DMT D6C 6-Inch Dia-Sharp Continuous Diamond Coarse Superior Diamond Sharpening Stones Legendary quality Made in the USA Excellent for small contact areas and 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