The RAP-B-202U contains a 1" diameter rubber ball connected to a flat 2.5" diameter base. This mount has pre-drilled holes, including the universal AMPS hole pattern.
High Strength Composite
B Size 1" Rubber Ball
The "U" in the part number reflects product packaged in poly bag.
RAM® X-Grip® Universal Holder for 7"-8" Tablets with Double Socket Arm