Norton Combination Grit Waterstone, 1000 / 4000 superior sharpening performance by utilizing water as a lubricant to develop a fast-cutting slurry. Among various sharpening methods, waterstones are widely regarded as for achieving razor-sharp edges, and Norton stones stand out in both man-made and natural categories for their exceptional quality. This waterstone features a dual grit of 1000 and 4000, allowing for an efficient, carefully planned sequence of sharpening that brings tools to a fine, precise edge. Due to the softness of the material, the stone will wear concave over time and requires periodic re-flattening. For maintenance, Norton recommends using their Flattening (#64236) and Prep (#64240) Stones to keep the waterstone in optimal condition. Measuring 8 inches by 3 inches by 1 inch, the waterstone comes in an individual plastic case for convenient storage and protection. Made in the USA. Model Number: 64236