Material and durability - Diamond construction provides high hardness, reliability, and wear resistance. The sharpener is strong and not easy to break. Double-sided design and sharpening capability - Double-sided structure: one side uses a single 800-grit groove for fine sanding, while the other side offers two 400-grit grooves for fast coarse grinding. - The different grooves let you sharpen hooks of varying thicknesses according to your needs, keeping edges sharp and effective. Portability and convenience - Easy to carry with a lanyard design that lets you hang it on your wrist. - Compact enough to fit in your pocket, allowing on-the-go sharpening without added bulk. Performance and maintenance - Suitable for polishing fishing hooks; a simple polish keeps hooks sharp for optimal performance. - By maintaining sharpness, you reduce the need to replace hooks frequently. 2-3 practical use scenarios - On a boat or by the shore: between casts, quickly restore hook edge after snagging on rocks or debris to maintain catching efficiency. - Freshwater or saltwater fishing trips: carry in your tackle kit for fast touch-ups during long days to keep hooks ready. - While traveling or camping: compact sharpener in a small kit to maintain hooks on the go without carrying extra tools. Summary - Material: diamond - Structure: double-sided with 800-grit single groove and 400-grit double grooves - Function: sharpens and polishes fishing hooks of different thicknesses - Portability: lanyard and pocket-friendly design - Performance: preserves hook sharpness to reduce replacement frequency