Ansen Tools AS-442 Grit Sharp 8 5/8-Inch Double Sided Diamond Whetstone Sharpener Extra Coarse/Coarse with a Non-Skid Rubber Base Double-sided extra coarse 180 grit-coarse 325 grit with advanced monocrystalline technology Extra coarse diamond grit is ideal for burrs and rough edges, while the coarse diamond grit quickly sharpens a dull edge 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