The RAM-240U consists of a 1.5" diameter rubber ball connected to a flat 3.68" diameter base.
This base has 3-hole 120 degree pattern pre-drilled holes that connects to RAM Tough-Dock™ Powered Docking Stations.
RAM® Double Socket Arm with Round Ball Plate
RAM® Double Socket Arm with 75x75mm VESA Plate
RAM® Double Socket Swivel Arm
RAM® Composite Double Socket Arm
RAM® Double Socket Arm