ITEM NAME:8" Ball Arm System Joint for Ikelite DS-200 Underwater Video Light Accessory Description: 8" Diving Light Ball Arm Joint to Underwater Housing. Wide Applicationï ¼Å¡mount flash light, on-camera field monitor to sliders, tripods more photography device with 1/4" hole. 25mm/1" diameter ball head , suitable for ball clamps and accessories. Part of the ball arm mounting system. Durable light weight aluminum and pc material. Specification: Materialï ¼Å¡Metal Ball Diameterï ¼Å¡25mm/1" Sizeï ¼Å¡22.5*2.5*2.5 cm/8.86*1*1 inch Package Includes: 1x Ball Arm(8").8" Diving Light Ball Arm Joint to Underwater Housing. Part of the ball arm mounting system. 1x Ball Arm(8").