The RAM® Double Ball Drill-Down Mount with Diamond Plate (RAM-B-138U) is a complete mounting kit for lightweight devices. This bundles comes with a 2.5" diameter round base that contains the universal 2-hole and 4-hole AMPS pattern, double socket arm, and diamond base adapter with 2-hole AMPS pattern. Built with B size components, this mount features the 1" diameter patented RAM® rubber ball and socket system. The double socket arm provides adjustment points at both ends for near-infinite positioning. The rubber ball and socket design also helps dampen shock and vibration, helping extend the life of your device. The hole pattern found on the diamond base adapter is compatible with most RAM® device holders.