The RAM-D-202U-SYM1 consists of a 2.25" diameter rubber ball, connected at right angles to a 3.68" diameter round base. There are 6 pre-drilled holes in the base.
RAM® Vertical Swivel Mount with Socket Arm
RAM® Horizontal Swing Arm Mount with Single Socket Arm
RAM® Double Socket Arm
RAM® Double Socket Arm with RAM® Pin-Lock™ Security Nut
RAM® Double Socket Arm with Jam Nut
RAM® Horizontal Swivel Mount with Socket Arm