2inch hexagon??

[drewdiggs]

I don't know what type of metal it is but, I was surprised it had no rust(maybe stainless?? Misplaced metal from a machine shop maybe?

 

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[Gambrinus]

It looks like what a machinist would call a "drop" scrap piece of material because the flat end looks like it was cut in a bandsaw.

To me it looks like the piece you have was being parted/cut off in a lathe but the machinist stopped leaving the round area that you can see and then started a new place to part/cut the piece.

You can buy hexagon stock in stainless steel, brass, aluminum etc. If you had a lathe you could make a nut or a bolt out of that piece.