Horizontal E Track Shelving KitE Track Shelving Kit Build shelves, dividers, or storage racks in your enclosed trailer using this simple and reliable E Track Shelving Kit. Each wood end socket snaps into standard E track rails and holds a standard 2x4 board to create a custom setup based on your storage needs. Kit Includes: (4) 5' Horizontal Galvanized E Track Rails (8) Wood End Sockets for E Track Key Features: Snap in sockets accept standard 2x4 lumber Galvanized steel E track