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 of hooks & 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.