DMT Diamond Whetstone For Aligner Kit 4.00 in. Xtra Coarse DM. This blade Sharpener expert product engineers at DMT is perfect for the avid knife user. For an incredible way to make sure your knife is is the sharpest around choose the DMT Diamond Whetstone For Aligner Kit. Specifications for DMT Diamond Whetstone For Aligner Kit: Manufacturer: DMT Length: 4 in Features of DMT Diamond Whetstone For Aligner Kit: Portable pocket convenience Extra Extra-Fine diamond for the finest polished edge of al bonded diamond abrasives Sharpens knives faster than conventional stones with DMT's monocrystalline diamond surface No oil is needed-sharpen dry or with water Durable construction will provide years of consistent performance and reliable service Package Contents: DMT Diamond Whetstone For Aligner Kit DMT DMA4X: Diamond Whetstone For Aligner Kit 4.00 in. Xtra Coarse