Norton Waterstone Flattening Stone, 9X3X3/4 is designed to maintain the flatness of waterstones, ensuring optimal sharpening performance. This durable flattening stone helps restore the surface of your waterstones, making it easier to achieve precise and consistent sharpening results. Its size of 9 by 3 by 3/4 inches provides ample surface area for efficient use, contributing to the longevity of your sharpening stones and tools. I for both professional and home use, this flattening stone is an essential accessory for anyone serious about keeping their sharpening stones in top condition.