Great to haul extra cargo to your next outdoor adventure, LeadPro's Roof Rack is constructed with high-quality, heavy duty steel with weather resistant powder coat finish to withstand the elements and combat rust and scratching. We recommend using Black Silicone sealant on all joints and around the end caps to further protect from rust. Easily installs with included u-bolts and mounting hardware on most crossbars: accommodates square cross bars that are under 4.6" wide x 1.375" thick or round bars under 1.375" in diameter. In order to be able to use the adjustable roof rack extension, please make sure that the crossbar distance is greater than 29.7". Weight capacity is 150 lbs.; for your safety please never exceed this cargo weight limit. Included steel wind fairing reduces wind resistance and noise during transportation.