Kinedyne Corporation E Track 1845 Beam Socket for Cargo Control, Shelf Brackets, Lofts Inside of Trailers - 10 Pack This listing is for TEN (10) heavy duty beam socket attachments. Model #1845 by Kinedyne Corp., a leader in the cargo control industry. Beam sockets are designed to attach to E track via a finger actuated spring clip. They are used with both horizontal and vertical E track to create repositionable shelving, an overhead loft, bunk beds etc. Once the beam socket is attached to the E track you would mount a board inside the slot (designed for a 2 x 4 or 2 x 6 boards) allowing you to create a multitude of configurations and designs. The steel beam sockets are zinc plated to inhibit rust and corrosion. The beam socket measures 4-1/4" high x 3-3/8" long x 1-7/8" wide.