The Max arm is specially designed for lighting, video, film and photography. It's an adjustable arm that allows you to position a camera, lighting fixture or accessory in any position within seconds! The two 5/8 (16mm) studs at either end are attached to ball joints rotate 360 degrees, plus a cut-out in the sleeve surrounding the joint allows the stud to be bent at a 90 degree angle. One stud is tapped to receive a 3/8 -16 thread, while the other is tapped to receive 1/4 - 20 thread. Each stud has six milled flat surfaces, so whatever you mount on the Max Arm will not rotate. The central elbow rotates 360 degrees for infinite adjustability. The Max Arm is equipped with user-replaceable special friction discs with anti-slip rosettes prevent unwanted movement. The adjustable ratcheted handle slowly increases tension until all three joints lock at once making precise positioning a breeze.