DMT's diamond knife whetstone sharpener offers a coarse diamond (45 micron / 325) that quickly restores neglected edges. This premium whetstone diamond sharpener comes with a durable plastic case complete with mounting capability and non-skid rubber feet. 6 by 2 by 3/4 inch whetstone boasts a durable construction that will provide years of consistent performance and reliable service. For proper tool maintenance, professionals rely on the superior quality and versatility of USA-made DMT products.