Vantech Universal Pickup Topper 2 Bar ladder roof van rack system 42"-45" A500 crossbars are made from 14-gauge steel, 2" X 1" rectangular bar. 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