The RAM-D-271U-2, round pipe base, consists of a 2.25" rubber ball connected that will connect to a pipe tubing diameter from 2" to 2.5" in diameter.
RAM® Double Socket Arm with RAM® Pin-Lock™ Security Nut
RAM® Double Socket Arm
RAM® Double Socket Arm with Jam Nut
RAM® Horizontal Swivel Mount with Socket Arm
RAM® Vertical Swivel Mount with Socket Arm
RAM® Horizontal Swing Arm Mount with Single Socket Arm