Norton Waterstone, 220-Grit superior sharpening results d to other commonly used methods. Renowned for its outstanding performance among both man-made and natural waterstones, this stone uses water as a lubricant to create a fast-cutting slurry that efficiently sharpens tools. By progressing through a carefully planned sequence of finer grits, you can achieve razor-sharp edges with ease. Due to the softness of the material, the waterstone will wear concave over time and requires periodic re-flattening to maintain optimal performance. For this purpose, Norton’s Flattening (#64236) and Prep (#64240) Stones are to keep your waterstone in top condition. Measuring 8" x 3" x 1", this waterstone comes in a convenient individual plastic case and is proudly made in the USA. Model Number: 64236