Connect your GoPro action camera to this Ikelite GoPro Mount with 1" Ball Mount Mark II to enable attachment to optional ball arms with 1" diameters. Such a configuration will allow you to capture video while simultaneously shooting stills with your DSLR or compact camera in its waterproof housing. An optional ball clamp is required.
To prevent slipping and enable a better hold with less force, the ball mount has a groove and an O-ring. It's made of aluminum that has been treated with a hard type III anodized finish for resistance to corrosion.