DMT FF70C Diamond Angler Mini-Sharp Sharpener - Coarse Superior diamond sharpening stones Legendary quality Made in the USA Ultra portable, key chain sharpener for fishhooks too Coarse diamond to transform a dull edge Sharpens knives faster than conventional stones with DMT's monocrystalline diamond surface No oil is needed-sharpen dry or with water Durable construction will provide years of consistent performance and reliable service