Can't tell but I also think it looks like a boring bar that goes in a boring head for the mill. Could also be used in a lathe but it's a bit short, a short bar is common with a mill boring head. Example of this is below.
If anyone needs them they are theirs for the cost of shipping. There is really not info on them other then a lot # and an item # that comes back to nothing. I'd hate to throw them out.