DMT 4 in. Diamond Whetstone Green DM. Diamond Knife Sharpener Whetstone has been designed to be the best available way to make sure your skis and snowboards are sharp and reliable. This Knife Sharpening System from the expert product specialists at DMT includes a water resistant pouch that is ideal for a day on the slopes. For a great way to make sure your knife is is the sharpest around choose the DMT 4 in. Diamond Whetstone. Specifications for DMT 4 in. Diamond Whetstone: Manufacturer: DMT Sheath Material: Leather Features of DMT 4 in. Diamond Whetstone: Quick edge repair anywhere Extra-Extra Coarse diamondfor extreme stock removal Hones edges faster than conventional stones with DMT's monocrystalline diamond surface No oil is needed-sharpen dry or with water Durable & flexible construction provides for customize use Package Contents: DMT 4 in. Diamond Whetstone DMT DMW4E: 4 in. Diamond Whetstone Green