DMT Diamond Whetstone 6.00 in. Plastic Case DM. This blade Sharpener from the expert product specialists at DMT feature the signature polka-dot pattern that traps metal debris to ensure clean continuous edge contact while the superior diamond does its work. For a superb way to make sure your knife is is ready for action choose the DMT Diamond Whetstone. Package Contents: DMT Diamond Whetstone DMT DMW6XP: Diamond Whetstone 6.00 in. Plastic Case