The RAM-B-23CHU8 chrome plated base consists of a 1" diameter rubber ball connected at right angles to a 2.43" x 1.31" diamond base 2.43" x 1.31" diamond base with 1" ball 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 Powder coated marine grade aluminum 1" rubber (B) size ball Display packaged For more information on this product check out this video.