I forgot to add measurements. It's approx 1 1/2 inches across, and the hollow thing is bout 3 inches. The head isn't a bolt head and looks to have been hit with a hammer a lot! The end is welded on there not a one piece like thing like a bolt head.
Could be some kind of spacer but have to have been off a big rig as it's overkill for something like our cars would have for a spacer. Could be a spacer for something but not sure why hollow on one end. Think i need more pics.