1. Convenient and multi-functional: use kitchen knife, camping outdoor knife or fishing hook. Every time you need to improve the edges of all serrated knives and hunting knives. Diamond knife sharpener is very suitable for hook knife and fillet knife2. Diamond coating material: this telescopic tool grinding rod is composed of diamond coated steel bars, which is solid and durable. Multilayer 400 grain single crystal diamond. The diamond grit sharpens the blade with several quick blows. Our sharpening bar is fine grained and easy to operate3. Multi function knife sharpener: The pocket knife sharpener is a portable pen shaped device, which can be used to sharpen almost any type of blunt knife. The sharpening bar has a special groove for the fishing hook. It makes those old and boring hooks look like new ones4. Adjustable length: Our serrated blade sharpening bar has adjustable length, with a tapered end and a flat end, which is comfortable and accurate. Pocket clip for quick and convenient storage. In addition, this retractable diamond sharpener will bring new life to all your blades and household tools