This little diamond coated fish hook sharpener looks almost identical to the Winmau pocket sharpener. It's great for roughing up the sides of the points so your darts don't fall out of the board. The sharpener is held in place by a knurled locking ring and reverses for storage. The sharpener has a flat side and a round side. The round side has a small groove for sharpening the tips of fish hooks. It comes in two lengths and has a pocket clip. I got the short one so it will easily fit in my dart case. It cost 6 bucks at my local fishing tackle shop.