These 4 low-profile legs are used to mount 2 Rhino-Rack crossbars or a Pioneer Platform to your vehicle. The legs have a locking cover for increased security. RCL Legs require a fit kit or track, sold separately. Heavy off-road use ready, these legs are made from glass reinforced nylon for high strength & durability. Tested and approved to Australian Standards AS1235-2000. Works with Rhino-Rack Vortex Bars, HD Bars (fit kit required and sold separately), and Pioneer Platform. Fit kits available to mount on a large variety of vehicles. Check our site for vehicle fitment. Made from high strength nylon reinforced with fiberglass, Rhino-Rack roof rack legs are some of the toughest and most durable roof rack components on the market. Engineered and tested in Australia in some of the toughest terrain on Earth. Engineered in Australia, built with high quality materials & craftsmanship. We're so confident in our product engineering & build quality that we offer a full 5 year warranty. Made for the long haul, Rhino-Rack RCL4 legs are built tough to withstand the daily abuse of off-road, on-road, & the ever-changing elements: sun, wind, rain & snow. Nothing is impenetrable, so we design for maximum durability.