Innovative, multi-patented DuoSharp® Bench Stone is a precision flat, two diamond surfaced sharpener guaranteed to provide consistent, even sharpening every time. 8" DuoSharp® Bench Stone, an excellent counter and bench sharpener, with a larger, wider diamond surface for sharpening a variety of edges. Coarse diamond (45 micron / 325 mesh) to quickly restore a neglected edge; Extra-Coarse diamond (60 micron / 220 mesh) when significant removal of material is needed for a damaged edge. Sharpening with diamonds is fast and easy. No messy oils needed, sharpen dry or with water. Durable construction will provide years of consistent performance and reliable service. For proper tool maintenance, woodworkers, chefs and other professionals rely on the superior quality and versatility of DMT® products. Made in USA.