Ansen Tools Grit Sharp AS-402 6-Inch Double-Sided Continuous Diamond Sharpener Coarse/Fine with Non-Skid Rubber Base Double-sided (Coarse 300 grit - Fine 600 grit) each side with monocrystalline advanced technology Coarse surface (300 grit) will quickly sharpen a damaged or dull edge and the diamond fine surface (600 grit)will bring back a razor sharp edge Will quickly sharpen the toughest materials, such as tool steel, carbide and titanium Ideal to sharpen cutlery knives, woodworking tools, garden tools and machine tools The sharpener sits in a compact case with a non-skid rubber base