DMT Dia-Fold Serrated Knife Sharpener

Tapered diamond files, designed to sharpen up your serrated knives, and also useful for garden tools and sharpening hard to reach areas. Foldable design, easy to transport and store. Blue - Coarse grit size is 45 micron, 325 mesh. Quickly brings back a duller edge to prepare for a finer grit. Red - Fine grit size is 25 micron, 600 mesh. For everyday sharpening, all purpose use. Green - Extra fine grit size is 9 micron, 1200 mesh. To polish and edge to a hair popping finish.