Looking to get a sharper edge, even on your most complicated blades? The DMT DiafoldĀ® Serrated Knife Sharpener is a multi-use sharpener for serrated edges and gut hooks, and works well as a conical file too. Measures 9.50" when opened and only 5" when closed. It features an extra fine 1200 mesh/9 micron sharpener (as indicated by the green hinge) to get the perfect edge. It folds up to save space and to protect the sharpener from damage.