The AccuSharp Diamond Rod Sharpener is an unbreakable diamond-coated steel rod used to sharpen all kinds of knives, including serrated edges. The retractable rod is engineered with a cone-shaped end for use on serrations and tight spaces.The diamond-coated steel rod also has sharpening grooves for use with all kinds of hooks, darts, and pointed objects and comes complete with a shirt pocket clip for easy storage.