Fish Skull Articulated Shanks are designed to simplify the tying of articulated flies. These hook shanks for articulated flies can be used in single-hook and two-hook articulated streamers and poppers. It is also used for streamers that use a free-swinging stinger hook such as Intruder-style salmon and steelhead flies. 20 shanks per pack. Sizes: 20mm, 35mm, 55mm.