Guaranteed not to hollow or groove, DMT's precisely engineered Dia-Sharp® Bench Stone with continuous diamond surface assures consistent, even sharpening every time. The 11.5" Dia-Sharp® Bench Stone provides long stroking areas and cutting edge performance for a quick, keen edge on small contact areas and pointed tools. Coarse diamond (45 micron / 325 mesh) to quickly restore a neglected edge. Includes non skid rubber feet. Diamond grit clearly marked on side of stone. 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.