Material: diamond plated carbon steel Type: pen-shape, pocket Size: 14cm(diamond dust sharpener) ,23cm(included hand shank ) Usage: general sharpening jobs, hunting, outdoor exploration, fishing etc. Feature: - Fishing Hook Knife Sharpener in a convenient pocket size with portable pen style - Great for hunters - fishermen, campers and archers. Handy for most any cutlery / tool sharpening need. Ideal for kitchen, campers, hunters, or workmen; also great for touching up knives, serrated blades and scissors; - Pocket knife sharpener with fine grit that features a D-shaped sharpening area with a groove for fish hooks. - Keep one in your tackle box, tool box and the kitchen drawer. Package Contents: 1 X diamond sharpener 1 X shirt pocket clip for storage This product is specifically designed for outdoor enthusiasts. With unbreakable and scalable feature. Electroplating diamond rod applies for a variety of high-end outdoor knife, including serrated knives. Single crystal diamond has the characteristics of less harmful to knife and with fast sharpening speed. Moreover, the diamond rod can be scalable in reverse, then you can adjust to variable lengths. Meanwhile, it has sharpening grooves for hooks and a shirt pocket clip for storage. The unit is light, compact, and durable.