A landlord from Michigan says:
June 7, 2016
I'm curious if you can identify this, it's the bottom sash and 1.5 inches. There is a hex nut. I can try and get more information if needed.
Paul from SWISCO responded:
June 9, 2016
I actually don't recognize this. Could you remove an undamaged version of this from the window and show us a few different angles? Thanks!