1. Safty for knives: this pen shape knives sharpener uses an unbreakable fine diamond-coated steel rod composed and the grinding layer is fine and smooth, which greatly prolongs the service life of the knives. 2. Suitable for fishing hooks, serrations and the gut hook: sharpening rod have a specially designed groove for fishing hooks, the conical part of the grinding rod design for serrations and gut hooks 3. Time and energy saving with quick sharpen. 4. Simply sharpening your knives a few times with our diamond steel, you can use your knives again, like it's new bought. 5. Suitable for variety of knives: half-round and flat surface of the sharpening steel for standard knives edges. Specification: Material: diamond + aluminum alloy Color: blue Telescopic length: 13cm-18cm Weight: about 50 grams Uses: general sharpening work, hunting, outdoor exploration, fishing, etc. DIY Supplies: Metalworking includes:1 x Knives Sharpener