Material Made from diamond material for durable, reliable sharpening with minimal particle shedding, suitable for all your fishing needs. Double-Sided Sharpening Three-groove design with two coarse slots (400 grit) for fast sharpening and one fine slot (800 grit) for a smooth finish, enabling easy, consistent hook maintenance. Portable and Convenient Pocket-sized sharpener with a hole for a lanyard to attach to key rings or gear bags, keeping it within reach on fishing trips. Use and Performance A double-sided hook file ideal for polishing hooks; a simple polish keeps your hooks consistently sharp for optimal performance. Use Scenarios - Riverbank or shoreline: quickly restore the edge after a snag or abrasion between casts. - On boats or kayaks: keep hooks sharp during long days without bulky tools. - Camping or travel: fits into tackle kits for field maintenance.