The popular Diafold Diamond Whetstone is now available with two grit combinations for the ultimate in sharpening versatility. For applications where a dull edge needs to be quickly restored, but a refined edge is required. Simply turn over to use the second grit. The length of the sharpening stone is 110mm. Grit: One side Blue Coarse, other side Black Extra Coarse. (325 x 220 grit) Size 110mm