BACKRACK SAFETY RACK FRAME, STEEL, POWDERCOATED BLACK -- 2 x 2 in. pickled and oiled square tube; Made of 0.19 in. diameter cold-rolled wire on 2 in. centers; Completely protects window and cab while offering more width to carry ladders and other long cargo; Designed for serious work trucks; Welded and assembled using state of the art robotic welding equipment; Mounted to the truck using rail mount brackets and toolbox brackets that reinforce strength and rigidity; Requires Hardware Kit Nos. 30103, 30102TB, 30104TB, 30107TB, 30108, 30109, 30112TB, 30117, or 30117TB For Proper Installation.