The Manfrotto Variable Friction Magic Arm is a fully articulated arm with 90° pivotable and 360° rotatable ends, and an elbow that rotates 360°. The knob allows partial loosening for safe and precise positioning of a light head or camera. It has 5/8" studs on ball joints at both ends with 3/8 and 1/4" female threads. It requires a Super Clamp or Base (available separately) for use.