Norton 8X3X1 Combination Grit Waterstone, 4000/8000 is a top-performing sharpening tool renowned for delivering results among commonly used sharpening methods. This waterstone uses water as a lubricant to create a fast-cutting slurry, allowing tools to be sharpened efficiently through a sequence of ever finer grits until razor sharpness is achieved. Made from a soft material, the stone naturally wears concave with use and benefits from 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, it comes in a convenient individual plastic case and is proudly made in the USA. Model Number: 24336