The 523 is a 3XL version of the 516. To compensate for the additional leverage generated from the extended length Firehole Outdoors increased the wire diameter by one size, e.g. 523 #10 and 516 #8 have the same wire diameter. This is a 3X long length hook with a 1X gape. It has a 60 degree down eye and is formed from a heavy weight wire. Available in sizes #4 to #14.
Firehole Sticks 523 Barbless Long Shank Jig Hook - Spawn Fly Fish
Firehole Outdoors Hooks - Fly Tying Supplies
Firehole Outdoors — Precisionflyandtackle
Firehole Sticks 633 – Tactical Fly Fisher
I love using this hook for a number of patterns. Especially good for caddis, emergers, and Czech nymphs.This is a standard length hook with a 2X gape. It has a straight eye and is formed from a medium weight wire. Available in sizes #6 to #22.
Firehole Sticks 316 Hooks 18
Firehole Sticks 516 Barbless 60 Degree Heavy Jig Hook - Spawn Fly
Perhaps the most unusual jig hook in our inventory. Great for stoneflies, leeches or any other fly that may require an extremely long shank, 3x
Firehole Sticks 523 Long Shank Jig Hook (36 hooks)
Firehole Barbless Hooks — NC Fly Shop
The 523 is a 3XL version of the 516. To compensate for the additional leverage generated from the extended length Firehole Outdoors increased the wire diameter by one size, e.g. 523 #10 and 516 #8 have the same wire diameter. This is a 3X long length hook with a 1X gape. It has a 60 degree down eye and is formed from a heavy weight wire. Available in sizes #4 to #14.
Firehole Sticks 523 - 14
Firehole Sticks - Fly Tying Hooks Firehole Outdoors – Dakota
Firehole Sticks Fly Tying Hooks 523 Size 4 : Sports