New 1.5" Ball Mount With Double Socket Arms ram Mounts Ram-111u-d With Long length double socket arm 5.22" L Ball 1-1/2" : Consists of a 2.5" diameter round base that contains the universal AMPs hole pattern a double socket arm and 6.25" x 2" rectangle base. 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 more. Made of Powder Coated Marine Grade Aluminum.