Guaranteed not to hollow or groove, DMTs precisely engineered Dia-Sharp Bench Stone with continuous diamond surface assures consistent, even sharpening every time. The 10 in. L is perfect for long or short knives and other tools and provides cutting edge performance for a quick, keen edge on small contact areas and pointed tools. Extra-Fine diamond (9 mic/1200 mesh) to polish and refine a razor edge after sharpening with a coarser diamond stone. 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.