AccuSharp Diamond Pocket Stone Knife Sharpener with Nylon Pouch The AccuSharp Diamond Pocket Stone is a dual-sided pocket sharpening stone featuring a 320-grit coarse diamond surface used for more aggressive sharpening, plus an 800-grit fine diamond surface used for honing and finishing. The Diamond Pocket Stone also has a groove used for sharpening all kinds of hooks and darts. The aggressive cutting feature can be used to sharpen all types of steel. The pocket stone comes complete with a handy AccuSharp carrying pouch with a built-in belt loop for convenience.