"The Elevate Outdoor Round Steel Side-Rail-Mounted Rooftop Cross Bars easily attach to your vehicle’s existing side rails and support up to 110 lbs. Designed to work on most vehicles, these powder-coated steel cross bars adjust to fit roof rails up to 48"" apart and as lockable to prevent unauthorized removal. Each bar measures 48"" L x 4.5"" W x 4.5"" D and the rounded 1"" diameter design works with most rooftop cargo carriers, soft-sided gear bags and similar items."