【Fits】：Very handy item to fit common Rain Gutter Towers on your camper shell, RV or whatever so you can mount roof bars, racks, boxes, Roof Top Tents or whatever. 【Install】：These artificial rain gutter plates Can be used mounted on the sides horizontally or on the top mounted, bolt to the sides of your vehicle roof and provide mounting points for gutter-mount roof-rack legs. This system allows the use of a traditional roof rack on raised or sloped roofs. Drilling required. 【Including】： Four enameled steel plates with a "J" channel on the bottom, backing platesalong,with matching rubber pads and a bag of required bolts, nuts and washers. 【Other】：The provided bolts are long enough for better stability. These artificial rain gutter plates bolt to the sides of your vehicle roof and provide mounting points for 2 Rhino-Rack gutter-mount roof-rack legs. This system allows the use of a traditional roof rack on raised or sloped roofs. Drilling required.