Ansen Tools Grit Sharp AS-408 All Weather Fold-Up Double-Sided Diamond Sharpener Coarse/Fine Double-sided, all weather, fold up sharpener with stainless steel base Double sided (coarse 400 grit/fine 600 grit) each side with monocrystalline and polycrystalline advanced technology The coarse diamond surface (400 grit) quickly sharpens a damaged or dull edge and the fine diamond surface (600 grit) brings back a razor sharp edge All weather, compact and lightweight, the handles fold to protect the diamond sharpener when not in use Sharpens the toughest materials in all conditions, including machine tools, wooodworking tools and all knives