The DMT Diafold® double-sided Sharpener is a multi-use sharpener for blades and tools. The DMT Diafold® double-sided Sharpener is a multi-use sharpener for blades and tools. Measures 9.50" when opened and only 5" when closed. It features a coarse 325 mesh/60 micron sharpener on one side, and a fine 600 mesh/25 micron sharpener on the other. It folds up to save space and to protect the sharpener from damage.