DMT Duo Sharp Bench Stone 10in x 4in x 3/8in Coarse/Extra Fine DMT. This Knife Sharpener from the good people at DMT features one coarse and one extra coarse side and measures 10" x 4" x 3/8" with a long life diamond surface with precision flatness. Don't venture outside without the DMT Duo Sharp Bench Stone Knife Sharpener. Specifications for DMT Duo Sharp Bench Stone: Manufacturer: DMT Grit: Coarse Fabric/Material: Stone Color: Tan Length: 10 in Width: 4 in Height: 0.375 in Features of DMT Duo Sharp Bench Stone Knife Sharpener: Measures 10" x 4" x 3/8" Long life diamond surface Precision flatness May be used alone or with DMTB8250 Duo Sharp Base which may be purchased separately Package Contents: DMT Duo Sharp Bench Stone DMT DMTW250ECNB: Duo Sharp Bench Stone 10in x 4in x 3/8in Coarse/Extra Fine