Diamond coated sharpener 25 micron (600 mesh) Handy pocket size Use dry or with a little water Take your sharpening anywhere with this handy credit card sized diamond sharpener from Dia-Sharp. This fine grade, diamond coated sharpener will sharpen tools and blades to a razor sharp edge without oil - use dry or with a little water. Fits handily in a wallet or pocket, and is supplied in a colour-coded vinyl holder. Fine grade sharpener: 25 micron (600 mesh). Dimensions 3 1/4" x 2" x 0.05". Extra-fine grade sharpener also available for refining razor-sharp edges (997 AJC).