Articulated fly shanks have gained in popularity in the last couple decades. They help create longer flies with natural movement. These shanks from Partridge of Redditch are available in two different sizes. It has a double shank for Intruder and other Waddington patterns when using single or double hooks.
20 pieces per package.
For shorter shanks, check out the
35 mm for size 2 and 4 hooks or larger
45 mm for #1, 1/0 and larger