1. Safe for knives: This pen-shaped knife sharpener uses an unbreakable, fine diamond-coated steel rod with a smooth grinding surface, which helps extend the life of your knives. 2. Suitable for fishing hooks, serrated blades, and gut hooks: The sharpening rod features a specially designed groove for fishing hooks, and the conical section is ideal for serrations and gut hooks. 3. Time and energy saving with quick sharpening. 4. Simply sharpen your knives a few times with our diamond steel rod to restore their sharpness, making them perform like new. 5. Suitable for a variety of knives: The half-round and flat surfaces of the sharpening steel work well on standard knife edges. Specification: Material: Diamond + aluminum alloy Color: Blue Telescopic length: 13cm18cm Weight: Approximately 50 grams Uses: General sharpening tasks, hunting, outdoor activities, fishing, etc. DIY Supplies: Metalworking Includes: 1 x Knife Sharpener