RAM Mount 1" Ball Mount w/Custom GoPro Hero Adapter [RAM-B-138-GOP1U]1" Ball Mount with Custom GoPro Hero Adapter The RAM B 138 GOP1U consists of a 2. 5" diameter round base with the universal AMPS hole pattern, STANDARD size double socket arm and 1" diameter ball with custom GoPror Hero adapter. The mount is designed with a RAM 1" diameter patented rubber ball and socket system that has adjustment points at both ends of the double socket arm; this allowing for almost infinite adjustment and perfect viewing angles. The