DMT W6FP 6-Inch Diamond Whetstone Sharpener - Fine With Plastic Box Superior Diamond Sharpening Stones Legendary quality Made in the USA Perfect fit at home or in the shop offering a sharpening surface to satisfy a variety of edge care needs Fine diamond for a razor sharp edge Sharpens knives faster than conventional stones with DMT's monocrystalline diamond surface No oil is needed-sharpen dry or with water Fine grit for razor edge; free replacement policy