DMT Diamond Bench Stone Extra Fine 10 in. DM. This Knife blade Sharpening System from DMT is for those who prefer a continuous diamond surface especially for sharpening small or pointed tools. For an amazing way to make sure your knife is will outperform the rest choose the DMT Diamond Bench Stone Knife Sharpener 10in. Package Contents: DMT Diamond Bench Stone 10in DMT DMD10E: Diamond Bench Stone Extra Fine 10 in.