X-Series XS410 NI5X All Purpose Saltwater Fly Tying Hook - Straight eye, wide gap, variable length, X-Strong, forged bend, V-Lock bend, micro-barb, BN5X finish. Simplify your salt, big-game and flats tying with this great all-around hook. With variable shank length and wire strength (optimized for size), this hook is perfect for flats flies in sizes 2-10 (Gotchas, etc,.), 1/0-2 permit flies (crab patterns), and baitfish up to 4/0 (i.e. Deceivers)