[20mm MOUNTING SYSTEM] securely attach this mounting arm assembly to any of our Bulletpoint Mounting Solutions bases with 20mm balls or 3rd party 20mm ball mounts (0.787 inches). [EASY TO POSITION] quickly and easily position the dual socket arm exactly where you want it thanks to the integrated thumbscrews. *Patent Pending* [CARBON FIBER + KEVLAR ARM] the strong and lightweight construction means this arm with dual clamps is built to last. [INTEGRATED THUMBSCREWS] the plastic thumbscrews make it both quick and easy to attach and adjust the position of your device holder. [QUICK-CONNECT] secure in seconds by sliding socket end over 20mm mounting ball and tightening into position with integrated thumbscrew.