This RAM Mount with 2 x 5" Square Plate & Round Plate from RAM MOUNTS features a central locking knob allowing you to support your device with one hand while positioning it, and then locking it in place with your other. It features a 2 x 5" rectangular mounting plate on one end, and a round mounting plate with a universal AMPS mounting pattern. Featuring two articulating joints, which are made using rubber ball and socket technology allows for nearly infinite position adjustment and dampens vibration.