AA-Racks Model DX36 Universal Pickup Truck Cap & Topper 3 Bar Ladder Roof Van Rack System Adjustable Steel Cross Bars - Sandy Black17 Gauge (1.35mm actual) Steel construction provides 350lb Max. loading capacity1.2" diameter cross bars;Length adjustable from 35" to 57"11 gauge (3.2mm actual) high strength steel mounting base*TOPPER/CAP NOT INCLUDED