The RAM upper Tele-Pole™, 8" male pole, contains a swing arm connection point that will attach directly to any double swing arm system with 1.5" Socket. The male post is 8" long and has a diameter of 1.328". The locking knob, includes a brass 5/16"-18 thread; this allowing you to disengage the screwing of the knob. Once you have set your mount in the location you need, you can lock it in place and feel safe that your mounted device will stay right where you left it.