Taidea # 1 Best Knife Sharpener, Diamond Mini Outdoor Portable Folding Knife Grinder, Pocket Sharpener, Knife Slicker, Serrated Blade, Knife Sharpening Tool, Compact Design Companion of Knives in Outdoor Activities, Easy to Carry (1051) Double-sided (Coarse 360 grit - Fine 600 grit) Coarse surface (360 grit) quickly restores a dull edge and the fine diamond surface (600 grit) will bring back a razor sharp edge Sharpens the toughest materials like tool steel, carbide and ceramics Ideal for machine tools, cutlery knives, woodworking tools The folding sharpener is ideal for your toolbox or taking it on the road. New YOYAL retail package.