5 double-sided slotted wooden holders for plates or film, film inserts included.
Look in decent condition, could use some cleaning and waxing slides.
The little levers at the top are to push down, eject the plate or metal film insert. There is a metal spring inside which provides upward pressure to the plate or insert.
5 for $100, or $25 each plus postage. Paypal accepted. I haven't found any pricing info on these