Anyone know what these are?

[painter777]

Jim
My girls believe you have a Hame fastener used on a work harness for pulling horses, mules or ox. Unusual because it has the double studded T which is used on the middle puller in a 3 wide.. but their not positive about the double T use.
When closed there is a clinch pin (I call them) round ring with pin attached that pokes in. Called a Hame line ring with stud.. per the girls.
Many different styles and many different ways of rigging depending on the chore at hand..... many styles found over the years.

That's what the Wife and Daughter say you have, so I'll go with it.