DMT DiaSharp 8in x 3in x 3/8in Extra coarse grit DMT. This Knife Sharpener from the folks at DMT measures 8" x 3" x 3/8" with a continuous surface and grit that is clearly marked on side of stone. Don't venture outdoors without the DMT DiaSharp Sharpener 8" x 3" x 3/8" Knife Sharpener. Features of DMT DiaSharp Sharpener 8" x 3" x 3/8" Knife Sharpener: Extra coarse grit Measures 8" x 3" x 3/8" Continuous surface Grit is clearly marked on side of stone Includes non-skid rubber feet Boxed with hanging tab Package Contents: DMT DiaSharp Sharpener 8" x 3" x 3/8" DMT DMTD8X: DiaSharp 8in x 3in x 3/8in Extra coarse grit