Manfrotto MA143A Magic Arm w/Camera Umbrella Bracket 143BKTThe Manfrotto 143A Magic Arm is a fully articulated arm with 90 pivotable and 360 rotatable ends, and an elbow that rotates 360. The lever tightens and locks for precise positioning of a small light head or camera. The Magic Arm has 5 8" studs on ball joints at both ends with 3 8 and 1 4" female threads. Although it is supplied with a camera platform, this item requires a Super Clamp or Base (available separately) for use.