This Tri-Seps Sharpener from Gatco offers a monocrystalline diamond rod for sharpening serrated blades, plain edge blades, scissors, and more. It measures approximately 4.5" with rubber end caps. A grooved surface provides for easy sharpening of smaller items like fish hooks, arrowheads, darts, etc. Item includes a clasp ball chain for attaching to a key ring or bag.