DMT D6E 6-Inch Dia-Sharp Continuous Diamond Extra-Fine Superior Diamond Sharpening Stones Legendary quality Made in the USA Excellent for small contact areas and pointed tools Extra-Fine diamond to polish and refine an 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