DMT 6 in. Dia-Sharp Diamond Extra-Fine DM. Dia-Sharp Diamond Knife has been manufactured to be the best available way to make sure your knife is kept properly maintained. This Sharpener expert product engineers at DMT is for those who prefer a continuous diamond surface especially for sharpening small or pointed tools. For an incredible way to make sure your knife is is ready for any cutting task choose the DMT 6 in. Dia-Sharp Diamond. Package Contents: DMT 6 in. Dia-Sharp Diamond DMT DMD6E: 6 in. Dia-Sharp Diamond Extra-Fine