Apex RB-1001-49 Side Rail Mounted Aluminum Roof Cross Bars-Universal Upto 50" Mounts to any car, SUV, or crossover rooftop side rails up to 50" apart No tools required for installation-- secures to roof rails with rubber-coated clamps and easy-to turn adjustment knobs Roof bars lock to side rails via key locking mechanism on adjustment knobs to prevent theft Manufactured from high-strength, lightweight aluminum with a 150 lb. weight capacity which will not rust Each bar measures 53-3/8" L x 2-1/8" W x 7/8" H Universal over-cab utility rack for transporting large cargo with no-drill installation Fully adjustable cross bars fit pickup trucks up to 66.5&#034; wide without drilling into bed Over cab design prevents damage to cab from cargo 6.25&#034; guard rails and several built-in anchor points for securing tie-down straps Manufactured from lightweight aluminum 800 lb. weight capacity