Ansen Tools AS-457 Grit Sharp 8 5/8-Inch Double Sided Diamond Whetstone Sharpener Fine/Extra-Fine with a Non-Skid Rubber Base Double-sided fine 600 grit-extra fine 1200 grit with monocrystalline advanced technology The fine diamond grit allows you to sharpen to a smooth and fine edge, while the extra fine diamond grit will polish and hone to razor sharpness Sharpens the toughest material including tool steel, carbide, titanium and ceramics Two stage sharpening ideal for cutlery knives, woodworking tools, gardening tools and machine tools The sharpener comes with a non-skid rubber base