SENYO'S ARTICULATED SHANKS for Steelhead AND Salmon Flies - Greg Senyo, , has developed a new articulated shank specifically for tying steelhead and salmon flies. This exciting new shank is poised to replace the aging Waddington Shank as the defacto platform for tying Intruder-style and other modern steelhead & salmon flies. These shanks work perfectly with Senyo's new INTRUDER TRAILER HOOK WIRE. SIZES: 25mm or 40mm