DMT DiaSharp 6in x 2in x 1/4in Extra coarse grit DMT. Knife Sharpener. This Knife Sharpener from the great people at DMT offers 12 square inches of continuous diamond surface and features grit that is clearly marked on side of stone. Don't explore mother nature without the DMT DiaSharp Sharpener 6" x 2" x 1/4". Knife Sharpener. Features of DMT DiaSharp Sharpener 6" x 2" x 1/4". Knife Sharpener: Extra coarse grit Measures 6" x 2" x 1/4" Offers 12 square inches of continuous diamond surface Grit is clearly marked on side of stone Includes non-skid rubber feet Hang packaged Package Contents: DMT DiaSharp Sharpener 6" x 2" x 1/4". DMT DMTD6X: DiaSharp 6in x 2in x 1/4in Extra coarse grit