Premium Material: The 1 inch ball mount base is made of heavy duty marine grade 6061 T6 aluminum alloy, CNC machined and III hard anodized surface for reliability and durability. Composition of Structure: The mounting base is made of 1 inch non-slip rubber ball attached to the square base, universal installation base for electronic device. Square base plate: Our square base includes a variety of holes pre-drilled with industry standard AMPS hole patterns. Compatibility: 1 inch ball joint mounting plate is compatible with 1 inch (approximately 2.5 cm) Base B double socket arms br>Wide Applications: Ideal for mounting on boats, kayaks, semi-trailers, cars, trucks, treadmills and various off-road vehicles for a wide range of uses.