RAM Composite Drill-Down Mount with Universal Action Camera Adapter (RAP-B-138-GOP1) (sku 51159)RAM Composite Drill Down Mount with Universal Action Camera Adapter (RAP B 138 GOP1) The RAP B 138 GOP1 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 GoPro 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