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 8" length is great for both long and short knives providing cutting edge performance for a quick, keen edge on small contact areas and pointed tools. The Extra-Coarse and Coarse grits are even perfect for flattening plane soles, irons and chisel backs. Includes non-skid rubber feet. Diamond grit clearly marked on side of stone. Choose from the following grits: extra-extra-fine, extra-fine, fine, coarse, extra-coarse or extra-extra-coarse. Stone measures 8" x 3".