Be assured of consistent, even sharpening every time with this DMT precisely engineered 8" x 3", coarse, dia-sharp bench stone with continuous diamond surface. The diamond grade is clearly marked on the side of the stone. It is made of the hardest material, most efficient sharpening abrasive, available in unique interrupted surface and continuous surface. Light pressure produces a sharp edge with just a few strokes. Use water for lubrication, no oil, smell or mess. It hones ALL hard materials: carbide, steel, etc.. Starts flat and stays flat, providing years of consistent, reliable use. Made in USA.