DMT 8in Diamond Whetstone Coarse grit Wood storage box DMT. Diamond Whetstone Coarse grit Knife Sharpener. This Knife Sharpener from the folks at DMT is features blue 325 diamond mesh and measures 8" x 2 5/8". Don't take off for the great outdoors without the DMT 8in. Diamond Whetstone Coarse grit Knife Sharpener. Specifications for DMT 8in. Diamond Whetstone Coarse grit: Manufacturer: DMT Handle Material: Wood Features of DMT 8in. Diamond Whetstone Coarse grit Knife Sharpener: Blue 325 diamond mesh Measures 8" x 2 5/8" Wood storage box Package Contents: DMT 8in. Diamond Whetstone Coarse grit DMT DMTW8C: 8in Diamond Whetstone Coarse grit Wood storage box