DMT Duo-Sharp DM. This Knife blade Sharpener from the professional engineers at DMT uses two interrupted surfaces of superior diamond to provide two-stage sharpening with fast clean and consistent results every time. For a superb way to make sure your knife is is ready for action choose the DMT Duo-Sharp Knife Sharpener . Package Contents: DMT Duo-Sharp DMT DMW8EFNB: Duo-Sharp