Vintage Barn Door, Gate, Head selling gate, Library Ladder Roller Hardware, Industrial / Steampunk Look

Okay, I'm not sure what this is, I can't find it with a Google search. It appears to be a door or gate or ladder roller. Or maybe parts to a cow head gate. It was probably a farm application, it had some what appeared to be manure caked on the rollers arms. The roller pieces measure 24" long. Need a good cleaning or maybe blasting. One selling of the small pieces is marked L85E. There must be a hundred uses for them.