His adapter consists of a 5/8″ (16mm) Stud on one side and a 5/8″ (16mm Receiver) on the other connected by a large ball joint.
The baby receiver has a metal knob to lock it securely in place. With the knob removed the outside of the receiver is a junior 1-1/8″ (28mm) pin that can fit into any junior receiver. The large ball joint is locked in place with a large metal knob with needle bearings to give you maximum torque.
The EZ Grip Finger allows to quickly change the position of a light fixture or any other accessory with a baby receiver.