Vantech Universal Pickup Topper 2 Bar ladder roof van rack system 42"-45" A613 Crossbars are reinforced aluminum with channels for accessories. Max Load capacity of 600 lbs. Galvanized mounting base and accessories for additional protection against rusting Clamps directly onto gutter rails for drill free installation Mounting bases are 10 gauge steel and 14 gauge cross bars *TOPPER/CAP NOT INCLUDED