The Smith's Diamond Retractable Sharpener is a compact, pen-sized tool designed for precision sharpening wherever you go. Featuring a diamond-coated steel rod with medium 400 grit, it quickly restores razor-sharp edges to straight or serrated blades. The rod is reversible, adjustable to variable lengths, and stores neatly in the handle when not in use. A built-in groove sharpens fishing hooks, while multiple layers of monocrystalline diamonds ensure durability and consistent performance. Lightweight and portable with a convenient pocket clip, this sharpener is perfect for knives, tools, and hooks in the field, on the job, or at home.