RAM 2.25″ Ball Mount w/ Long Double Socket Arm, 11″ x 3″ Rectangle Base, and 3.68″ Round BaseThe RAM-D-111U-E consists of a long length double socket arm, 3.68″ diameter round base and 11″ x 3″ rectangular base. The round base contains pre-drilled holes, including two holes at 180 degrees and three holes at 120 degrees. The rectangle base contains different combinations of pre-drilled holes which will match up to many electronic devices and mounts, including Marine GPS, CB Radios, Ham Radios, Gimbal Brackets and moreSpecifications/FeaturesWeight Capacity: Up to 15 lbs. Material: Powder Coated Marine Grade Aluminum Ball Size: 2.25″ Rubber “D” Ball Size