Innovative, multi-patented DuoSharp® Bench Stone is a precision flat, two diamond surfaced sharpener guaranteed to provide consistent, even sharpening every time. The 10" counter or bench sharpener offers larger, wider diamond surface for sharpening a variety of edges including shears, cleaver and specialty knives, plane sole, machete, etc. Extra-Fine diamond (9 micron / 1200 mesh) to polish and refine a razor edge after sharpening with a coarser diamond; Coarse diamond stone (45 micron / 325 mesh) to quickly restore a neglected edge. Sharpening with diamonds is fast and easy. No messy oils neededsharpen 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.