This 8" Ball to YS Mount Arm from ULTRAMAX is equipped with a standard 1" diameter ball joint on one end and a standard YS connector on the other for attaching a strobe or video/focus light. The ball-joint end fits into the ULTRAMAX UXCLM-1 Clamp or other clamps for 1" balls, which are available separately. Such a clamp will allow you to connect the arm to a ball-mount base on an underwater camera tray or grip handle, or to another ball-jointed arm. Built for durability, the lightweight arm is made of fiberglass-reinforced plastic, so you need not worry about rust.
ULTRAMAX UXFA-3 Specs
Standard 1.0" / 2.5 cm diameter ball mount Standard YS connector