Ram Mount 2.43 x 1.31 Inches Composite Diamond Base with 1-Inch Ball Consists of a 1" diameter rubber ball connected at right angles to a 2.43" x 1.31" diamond base The base has two holes 1.912" from center to center Matches the industry standard AMPS hole pattern and will connect to a large variety of RAM Mount and third party cradles High Strength Composite 1" Rubber Ball "B" Size High Strength Composite Base has two holes 1.912" from center, matches the standard AMPS hole pattern and will connect to a large variety of RAM Mount & third party cradles The RAP-B-238U consists of a 1" diameter rubber ball connected at right angles to a 2.43" x 1.31" diamond base Lifetime warranty