Diamond grit clearly marked on side of stone. No oil is needed-sharpen dry or with water For proper tool maintenance, woodworkers, chefs and other professionals rely on the superior quality and versatility of DMT products., Made in USA. DMT Dia-Flat Diamond Lapping Plate - 10 Inch - Extra Extra Coarse DMT 10 in. Dia Sharp Bench Stone Coarse D10C - The Home Depot Coarse diamond(45 micron / 325 mesh) to quickly restore a neglected edge. Includes non-skid rubber feet. Sharpens knives faster than conventional stones with DMT's micronized monocrystalline diamond surface The 10 length is perfect for long or short knives and other tools and provides cutting edge performance for a quick, keen edge on small contact areas and pointed tools. Sharpening surface accommodates range of edges— from large knives to small pointed tools Full range of DMT sharpening stones in stock in the UK! Including diamond whetstones, Duosharp, Diasharp and Diafold ranges and much more Coarse diamond to quickly restore a neglected edge. Tool Maintenance Stone DMT D10C 10.0" X 4.0" Dia-Sharp® Bench Stone - Coarse Diamond (45 Micron / 325 Mesh 10 Inch Bench Stone