Double-Sided. Innovative. Multi-Patented. DuoSharp® Bench Stones are precision flat, two diamond surfaced sharpener guaranteed to provide consistent, even sharpening every time. Employs DMT® interrupted surface technology. Available in 10-in and 8-in. sizes and offered with the DuoBase™ accessory or non-skid mat, this is the ultimate choice for bench sharpening, with a large, wider diamond surface to sharpen a variety of edges. Available in many different diamond grit combinations.