GEM HD Back Rack gives you the strength and flexibility to get the most out of your truck box. Perfect for weekend adventures or hard work. The Back Rack has adjustable height from 18 in.- 30 in. for ultimate utility and versatility and is rated for up to 550 lbs of carrying capacity. Easy no-drill installation in minutes with a simple clamping mechanism that fits all common truck beds with no fuss and a sure grip. An integrated molded rubber pad adds extra protection and prevents any marking of your truck. Built to never rust with military grade aluminum and a durable powder-coat finish to keep looking great. They also feature ultra strong tie down loops and a bottle opener for a little fun at the end of the trail. Choose the best length of GEM HD Crossbars (sold separately) that make adding standard gear mounts and accessories fast and simple. With t-slots on the top and bottom of the bars, your mounting options are endless with either GEM accessories or many other brands. Available tonneau cover adapter kit for mounting on select t-slot tonneau covers.