Ansen Tools Grit Sharp AS-418 6-Inch double Sided 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 finished diamond surface (600 grit) will polish and hone to an extra fine finish Will quickly sharpen the toughest materials such as titanium, ceramics, tool steel and carbide Two stage sharpening ideal for cutlery knives, woodworking tools, garden tools and machine tools The sharpener stores in a latched, compact wooden box