Sharpal 162N Dual-Grit Diamond Whet stone that measures 8 in. L x 3 in. W is capable of handling a wide variety of edges including kitchen and pocket knives with either a single or double bevel on the blade, tools and much more. With Mirror Flat technology, hard wearing surface and durable design, it guarantees consistent, even sharpening for years of dependable use. It is double-sided with both coarse and extra fine diamond surfaces. Use the coarse diamond stone 325 grit (45 micron) to quickly and easily restore a dull or damaged edge. Use the extra fine diamond stone 1200 grit (9 micron) to hone. Sharpen dry. No messy oil needed. It comes with a high-impact plastic self-storing case with non-slip rubber pad that can be used as a stone base while sharpening. More value-added gadget is the patent pending Angle Pyramid Sharpening Angle Guide integrated with 4 angles-14°, 17°, 20°, 25° for choice for almost all kinds of knives.