The AccuSharp 4in1 Knife and Tool Sharpener combines every sharpening necessity into one pocketsized unit. Featuring coarse tungsten carbide sharpening blades and fine ceramic rods the unit comes with a retractable diamondtapered rod used for deep serrations. The rod also has a groove for all of your hooks and darts. Plus the unit comes with a retractable flat diamond file for users who prefer a continuous surface for their sharpening needs. Grits Diamond Rod 400 Diamond File 400 Ceramic Fine 1500.