As far as I have been able to tell none of the hook manufacturers have 3D files for their hooks. At least not that they are willing to share. Every time somebody wants me to make a new mold using a new hook (except for some really generic stuff) I have to model it up from scratch.
I have developed a system where I outside dimension everything.
7216 - Dimension.jpg
Then using offsets, and curve tools I create a center line for the hook wire.
7216 Centerline.jpg
When I extrude a solid cylinder along the center line I can check my results against the original outside dimensions.
7216 Checks.jpg
Finally, I have a rough 3D Model of the hook I can import into the model of a bait mold I am creating.
7216.jpg
It's far from perfect, but its good enough to make sure everything fits into the final mold.