AA-Racks Model X37 Heavy Duty Rain Gutter Van Roof Rack Round Two Bar Set Steel Matte White Our unique Three-bolt Lock design makes it compatible to most van rain gutters; while keeping the stability for the loads, it is easy to install & uninstall. The Protective Rubber Covers on both clamps prevent metallic friction on the gutters, which also further reduce chance of rusting. Cross bars are built with the thickness of Gauge Grade No. 13 (2.25mm actual steel thickness) for heavy-duty purpose. The Oval Shaped design of the uprights are Height-reduced, ( less than 11 while installed ); this design not only prevents water leakage & improves wind noise problems, it also makes your vehicle more accessible to most height restrictions. This unit is powder-coated with Weather Resistant paint available in two color options: Matte Black & Matte White.