DMT Pocket Diamond Stone DMT. This Knife Sharpener from the great folks at DMT measures 4 3/8" x 7/8" with red fine grit. Don't explore the great expanse of mother nature without the DMT Pocket Diamond Stone Knife Sharpener. Specifications for DMT Pocket Diamond Stone: Manufacturer: DMT Sheath Material: Leather Features of DMT Pocket Diamond Stone Knife Sharpener: Measures 4 3/8" x 7/8" Red fine grit Comes with leather sheath Package Contents: DMT Pocket Diamond Stone DMT DMTW4F: Pocket Diamond Stone