It's a hand-made bearing press. Similar to what I linked below. Someone welded a piece of round stock to a nut for leverage.

Balancer installation tool or possibly beating press

References:

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Reason:
I think you're right as the harmonic balancer, but is there any way to tell what make/model it might go to?

it looks like some kind of a roller a roller goes in between the two hubs and is tightened down and used on a roller table

References:

I work in a roll division and it looks almost like some of the tables or conveyers

Reason:
Could you identify precisely what this fits. Please provide a reference link if at all possible.

It's a hand-made bearing press. Similar to what I linked below. Someone welded a piece of round stock to a nut for leverage.

References:

http://www.bikebling.com/Santa-Cruz-Bearing-Press-Tool-LT-2-0-Nomad-2-0-D-p/s...