360 Degree rotatable & 90 Degree tiltable double ball head magic arm Mounts via 1/4'-20 thread screw connector on one end 1/4' thumbscrew with ARRI locating pins on other end Light stand head with 1/4' thread hole & ARRI locating pins Light stand head's internal column diameter: 16mm Light stand head comes with 1/4''-20 male connector A central single-point locking mechanism Material: Anodized Aluminum Alloy