Part of the super knuckle system, this CNC machined aluminum ball with 3/8in-16 screw and Arri locating pins prevents equipment from rotating after mounting. This feature is a widely used connection in the video and cinema industries regularly found on camera cages. A knurled tightening knob can be tightened by hand via the thumbscrew, and can provide for easy quick release. A #3 Allen Key can also be used to re-tighten if necessary.