Arm:RAM-201U standard length sized arm for 1.5 inch balls. The arm measures 4.55 inches between socket centers (5.625 inches in overall length). A plastic twist knob allows you to articulate the arm in any direction.
Adapter Plate: RAM-202U 2.5 inch diameter base with pre-drilled holes and 1.5 inch diameter rubber ball. The pre-drilled holes accommodate the AMPS hole pattern.
RAM-201U Options (Not Included): The RAM-KNOB5LU shown below is a keyed lock and replaces the twist knob found on the RAM-201 series arm.