OK, Fellas.
I'm finally sorting a giant bin of assorted aircraft hardware (OK, my students are) that was given the Foundation many years ago.
After several years of "Hunting and pecking', I've decided to coerce a few "volunteers" to help sort it out.
While doing so, I've come across a bunch of hardware I've never seen before, but one particular piece intriques me. They appear to be some type of Riv-Nut, but are shaped much differently on the outside and are anodized in different colors and one end is hex shaped..
So... What are they and what are they used for?
Here are some pictures..