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tool included in a box from an estate sale
(lemmy.dbzer0.com)
I feel like I knew what this thing was right up until I had one. Two tool id site had no idea, and one said it's a ball joint separator, but I can't find any that look like this, and I swear I've seen them in stores, but can't remember where.
Maybe a type of bearing press?
I'm pretty sure it's a type of bearing/gear puller. You'd slide the jaws around the bearing and use the screw to press against the shaft to pull the bearing off.
This. But most pullers I've seen have unfixed jaws to accommodate a range of bearings.