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The RAP-B-166-GOP1 consists of a 3.3" diameter suction cup twist lock base, double socket arm and 1" diameter ball with custom GoPro® Hero adapter.............
The RAM-B-189BU consists of a double 3.3" twist lock suction cup base. Included is a hole pattern that will allow attachment to all RAM bases that contain the universal AMPs hole pattern.
The RAM RAM-B-125BU, curved extension base includes a 1" rubber ball; it allows for almost infinite adjustment and perfect viewing angles.