A DMT single-sided Diafold (FWF). Fine diamond, 25 micron / 600 mesh. 9 1/2" open, 5" closed. Folding plastic handles enclose the diamond when shut. Use dry or with water. Sharpener made in USA; other components made in China. Specs from DMT's Single Sided Diafold Sharpener Fine page.
Same folding Diafold as the coarse. This one is the fine grit.
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