The Rhino-Rack RL Leg Brackets are heavy-duty specially designed gutter mount legs, fitting vehicles with factory extruding gutters. These legs are designed to hold Heavy Duty bars or Vortex Bars. These legs are 11cm tall (4.33" tall). For vehicle roof rack setups that require a third cross bar, this two leg kit will fit one Rhino-Rack Heavy Duty bar or one Vortex Bar, sold separately. Since these legs are gutter mounted, installation is as easy as measuring, adding a bar and clamping with the included hardware and allen key/wrench. RL Legs come in a variety of shapes designed to fit specific vehicles. There are four main leg heights, depending on how much clearance your roof racks need: 11cm, 15cm, 21cm and 28cm heights. Constructed of glass reinforced nylon, these legs are UV resistant and will easily outperform the competition - especially those cheap plastic legs. The standard 5 Year Manufacturer Warranty means quality and peace of mind.