Apontus Universal 51" Roof Rack Crossbars Material: Strong steel construction with a black paint finish Measurement: 51" x 1 1/4" x 7/8" Package includes (2) vehicle rectangular/square shaped roof cross-bars designed to clamp to existing roof side rails, maximum 130 lb. total capacity Adjusts to fit side rails up to 29" - 48" apart maximum Each clamp has its own built-in lock and key