RAM GoPro Hero Adapter with Short Double Socket Arm and Flat Surface Mount. (sku 18974)RAM GoPro Hero Adapter with Standard Double Socket Arm and Flat Surface Mount RAM B 138 A GOP1 The Mount consists of a 63. 5mm (2. 5") diameter base with 1" ball and the universal AMPs hole pattern. The GoPro Hero Adapter attaches directly to the underside of the camera, replacing the factory mounting bracket. Adjustment points at both ends of the 1. 75" double socket arm allowing for optimum viewing position The rubber ball and socket system absorbs