Attach lighting arms with 1" ball mounts to the 1/4"-20 top mount on many Ikelite DSLR housings via their 1" Ball Mount Mark II, which includes a stainless steel screw. Compatible arms include those from Ikelite, TLC, Ultralight, Nauticam, and other brands.
A groove and O-ring on the ball prevent slipping for a better hold with less force, improving on the design of the previous #9571.6 model. The mount is constructed from aluminum that has been treated with a Type III hard anodized finish for excellent corrosion resistance. It ships without a required, compatible 1" ball clamp, which is also available from B&H. Conveniently, the older and newer mounts and clamps are interchangeable.