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The RAP-B-111B-354-TRA1 consists of a Track Ball™ base, composite double socket arm and 6.25" x 2" rectangle plate. The 6.25" x 2" rectangle plate 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. The Track Ball™ base can connect to virtually any track system including the RAM Tough-Track™. T-Bolt Dimensions: .48" x .95" Overall Height: 6" Plate Hole Patterns