You are buying a set of (2) Two E-Track Square with the spring Clips that are zinc plated.  The square tubing is 3/8" with a usable inside measurement of 2".  They have many uses for company, home, personal uses with e-track.   Interior trailer hanger to hold cargo in place including Ropes, Wires, Straps, tool and other items..    Also great with wall e track for hanging other items. Many enclosed trailers uses..   Any questions please ask.