Round base, 2.25 in.
6.2 cm (2.4375 in.) AMPS, 2.25 in. ball (Size D) - RAM-D-254U
This round base is a good foundation for your individual RAM Mount system.
This base has a diameter of 6.2 cm (2 7/16″) and has four holes in industry standard AMPS (rectangular array, 30×38 mm). The base may also be used for attachment of device carriers without ball (see description of that products).