Ansen Tools Grit Sharp AS-422 Premier 8-Inch Double-Sided Diamond Sharpener Medium/Fine with a Non-Skid Rubber Base Double-sided Medium 400 grit - Fine 1000 grit ) each side with monocrystalline advanced technology Guaranteed flat surface will provide years of constant service The coarse diamond surface will quickly restore a neglected, dull edge and the fine diamond surface will polish and hone to a razor sharpness Ideal for the toughest materials, including tool steel, carbide, titanium and ceramics Will sharpen and hone to a fine edge all types of cutlery knives, woodworking tools, garden tools and machine tools