DMT 8 in. DuoSharp Bench Stone Fine/Coarse DM. DuoSharp Bench Stone has been manufactured to be the ideal way to make sure your knife is kept properly maintained. This Knife blade Sharpener from the expert product specialists at DMT is innovative multi-patented and engineered to be precision-flat and usees two interrupted surfaces of superior diamond to provide two-stage sharpening with fast clean and consistent results every time. For an incredible way to make sure your knife is will outperform the rest choose the DMT 8 in. DuoSharp Bench Stone Knife Sharpener. Specifications for DMT 8 in. DuoSharp Bench Stone: Manufacturer: DMT Blade Material: Rubber Package Contents: DMT 8 in. DuoSharp Bench Stone DMT DMW8FCNB: 8 in. DuoSharp Bench Stone Fine/Coarse