DMT WS4XX 4 3/8-Inch by 7/8-Inch by 3/16-inch Diamond Whetstone Model Extra-Extra Coarse,DMT,WS4XX" /> Legendary quality Made in the USA Quick edge repair anywhere Extra-Extra Coarse diamond for extreme stock removal Hones edges faster than conventional stones with DMT's monocrystalline diamond surface No oil is needed-sharpen dry or with water Durable & flexible construction provides for customize use