Made from steel this WaterPORT™ mount fits on most platform style roof racks: Prinsu, Front Runner, Echotune, SSO, and Wood Grain Warrior. Both variations also come with mounting hardware (2 1/4x1" carriage bolts, locking nuts, and washers), but extra or specialized hardware may be needed depending on your rack. Important Notice: The Universal Mount Plate is needed with the Platform Rack Mount if you don't already have one.