SRM300 DualRail Kit for 40 Inch Long x 40 Inch Wide Rack Rails only Black Go RhinoSRM300 Rails Kits come with a Limited Lifetime warranty on materials and construction and a 5 year warranty on the Textured Black Finish. Features and Benefits: 1 8? Thick cross rail support brackets 1? Diameter 16 ga. Aluminum tube Available in 40, 60 Inch and 80 Inch long configurations Bolts to 4 CORE Cross Rails Designed to work with SRM300 Line Fully welded frame for strength Limited Lifetime warranty on materials and construction and a 5 year