Ansen Tools AS-448 Grit Sharp Premier 8-Inch Double Sided Diamond Sharpener Extra Coarse/Coarse with a Non-Skid Rubber Base Double-sided extra coarse 120 grit-coarse 240 grit with advanced monocrystalline technology Guaranteed flat surface will provide years of constant service The extra coarse diamond grit is ideal for burrs and rough edges, while the coarse diamond grit will quickly sharpen a dull edge Sharpens the toughest materials including tool steel, carbide, titanium and ceramics Two stage sharpening ideal for cutlery knives, woodworking tools, gardening tools and machine tools