Manufacturer Part Number: RAM-B-231Z-2-A-366U
RAM Large Strap & U-bolt Base with Short Double Socket Arm & 1/4-20 Camera Threaded Adapter
The RAM-B-231Z-2-A-366U is a Complete Kit. You may need to purchase other components to complete your setup
Consists of a 1/4" - 20 X 0.25" camera thread, connected to a 1" diameter rubber ball, Short socket arm with 1" Diameter balls and a steel strap base to fit rails 0.5" to 3.15" in diameter.