➤Length: The double socket arm total length of the device is 3.54 "(90mm) ➤Near-infinite Adjustable: The double ball and socket technology allows for near-infinite adjustability mounting bases and device holders,easy connection, easy to adjust and compatible with ram mount extension arm. ➤Universal Compatibility: Compatible with RAM Mounts B Size 1" Ball Components, this swivel arm mounting solutions for various devices with B size 1'' ball components, including mounting bases and device holders. ➤Wide Usage:They are extremely versatile and using them for all kinds of stuff ,phone holder, tablet holder. Car,motorcycle,atv’s, bicycles and mount gps units, rear view mirrors, cell phone holders, gopro cameras,etc.