DMT Dia-Sharp Diamond Bench Stone Sharpener Extra Fine 4 in. DM. is the best way to give yourself the edge. This Knife blade Sharpener from DMT is for those who prefer a continuous diamond surface especially for sharpening small or pointed tools. For a great way to make sure your knife is will outperform the rest choose the DMT Dia-Sharp Diamond Bench Stone Knife Sharpener 4 in.. Package Contents: DMT Dia-Sharp Diamond Bench Stone 4 in. DMT DMD4E: Dia-Sharp Diamond Bench Stone Sharpener Extra Fine 4 in.