The Rhino-Rack Vortex Beacon Mounting Plate is designed to adapt a standard beacon light to your Rhino-Rack Vortex bar. For the night contractor or outdoor enthusiast who wants to make sure their vehicle is seen by all. Made from Galvanised Steel, with spring washers Includesded, this mounting plate can withstand the harshest conditions and the hardware won't come loose while driving on corrugated roads. The installation is simple and easy to create custom lighting configurations. Using two t-bolts, the plate is secured to your roof racks using an Allen Key which is provided.