Same as our Bolt-On model, while adding a universal rail-clamping base, designed to fit square or round tubing from 3/4 inch to 1-1/4 inch diameter (by adding a 1/4-20 x 3” bolt, this base will fit up to 1-3/4” tube). This rugged base is made from extruded aluminum, an aluminum ball, and includes stainless steel hardware. Constructed from engineered polymers and aluminum. Easy adjustment for multiple configurations. No assembly required. Comes with lifetime a guarantee. MC/ATV mount used for vehicles such as: airplanes, ATV's, motorcycles, tractors, golf carts, snowmobile, jetskis, . Holds devices such as: GPS, cameras, fishfinders, and CB's.