Ansen Tools Grit Sharp AS-437 8 5/8-Inch Double-Sided Diamond Whetstone Sharpener Medium/Fine with Compact Wooden Storage Box Double-sided (Medium 400 grit - Fine 600 grit) each with monocrystalline advanced technology Medium diamond surface (400 Grit) easily smooth's a worn edge and the fine diamond surface (600 Grit) will polish and hone to a fine finish Will quickly sharpen the toughest materials, such as tool steel, carbide, titanium and ceramics Two stage sharpening ideal for cutlery knives, woodworking tools, garden tools and machine tools The sharpener stores in a latched, compact wooden box