M8 ball joint, with M8 thread in the lower part and hexagonal threaded insert in the upper part, enabling it to be tightened with a simple Allen key. Made of anticorodal aluminum and anodized to 40 microns (military standard), it guarantees maximum durability and excellent resistance to wear and seawater. It can be easily adapted to different supports, strobes, lights, etc. An O-ring in the center of the ball joint acts like a clutch: the ball joint tightened by the clamp can be loosened so as to move the arm in the water without having to retighten it.