Ansen Tools Grit Sharp AS-431 Premier 8-Inch Double-Sided Diamond Sharpener Coarse/Fine with a Non-Skid Rubber Base Double-sided (Coarse 300 grit - Fine 600 grit) each side with monocrystalline advanced technology The coarse diamond surface will quickly sharpen a damaged or dull edge and the fine diamond surface will bring back a razor sharp edge Guaranteed flat surface will provide years of constant service Ideal for the toughest materials such as carbide, titanium, tool steel and ceramics Will sharpen and hone to a fine edge all types of cutlery knives, woodworking tools, garden tools and machine tools