Zacuto Zamerican V3 - Large 12 inch Articulating Arm Heavy Duty and robust but extremely lightweight Made with chrome balls for silk movement and aluminum ends for rust reduction Quick Releasable - devices can quick release off of both ends of the arm Arms can be extended to any length using Zacuto male rod extensions Must be used with (2) Zacuto Z-release mounts or 1/4 20" adapter