Accusharp, Diamond Pocket Stone, Dual Sided Pocket, Featuring A 320 Grit Coarse Diamond Surface, Used For More Aggressive Sharpening Plus An 800 Grit Fine Diamond Surface Used For Honing & Finishing, Groove Used For Sharpening All Kinds OfHooks & Darts, Aggressive Cutting Feature Can Be Used To Sharpen All Types Of Steel, Comes Complete With A Handy Carrying Pouch With A Built-In Belt Loop For Convenience.