Hook anatomy and hook types
Hooks for all purposes
By Martin Joergensen
Let's look at a hook, and try to put the right terms on the right parts. This picture shows a hook (note that it actually is a rare vertical eye hook, great for this purpose).
The letters represent:
- Eye width - a good measure to use when indicating small distances in the pattern, especially in the front
- Overall length. The hooks 'outer' horizontal dimension
- Shank length. The length of the part we normally tie the fly on
- Bend - it can be difficult to determine where the shank ends and the bend begins, especially on curved hooks.
- Barb length - sometimes use to measure out tag/butt placement on salmon flies
- Gap (or sometimes gape) - almost the same as the hooks' overall height
Read more about hook selection for salt water flies
Read more about salmon fly dimensions
I have selected a straight shank, straight eye hook for this example, but hooks can be very different from this scheme as you see here:

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Submitted September 9th 2006
I beg to differ with one of your terms. (F) is not the "gap" but is the "gape". The "gap" is the space between the shank and the tag end of the bent eye. For a better detail see the book by William Schmidt "Hooks for the Fly" published by Stackpole Books.