Quickly restore an ultra keen edge on any blade. Two different sized hones for sharpening any type of blade. The "pocket" hone is 5 inches long with a usable length of 2.5 inches. The taper end has a #600 grit while the multi-function end has a #320 grit. The abrasive material is diamond. The pocket hone is a retractable 4-function hone with a flat edge for sharpening items like scissors and a round hone for knives. The tapered end is designed to sharpen serrations and knives.