SRM500 Side & Rear Rail Kit for 55 Inch Long Rack Textured Black Go RhinoThe Tri Rail kit is constructed entirely out of 2 Inch aircraft grade aluminum tubing and is designed to work seamlessly with the SRM500 roof rack. Tri Rail kits contain your gear on both the sides and the rear of the rack for a step up in security over the Dual Rail kit. The rear rail also serves as a perfect location to mount scene camp lighting. Features and Benefits: Black GEOMET coated steel hardware Constructed entirely out of aircraft grade