Create durable DIY load bars, shelves, beds or storage areas by placing a piece of plywood across two wood beams held in these sockets. You'll get a stable, steady structure. Use the rotating hinge on the wood beam socket to increase the functionality of your trailer space. Simply rotate socket on the hinge to store beams on the wall when they aren't needed. Change up your trailer storage system any time with this E-Track mounted socket. These sockets move easily in and out of E-Track fittings so your bars or shelves are adjustable.