DMT Coarse Pocket Stone DMT. This Knife Sharpener from the knife experts at DMT measures 4 3/8" x 7/8" with blue coarse grit and 325 mesh. Don't go outside without the DMT Coarse Pocket Stone Knife Sharpener. Specifications for DMT Coarse Pocket Stone: Manufacturer: DMT Blade Material: Stone Sheath Material: Leather Features of DMT Coarse Pocket Stone Knife Sharpener: Diamond Stone measures 4 3/8" x 7/8" Blue coarse grit 325 mesh Comes with leather sheath Hang packaged Package Contents: DMT Coarse Pocket Stone DMT DMTW4C: Coarse Pocket Stone