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