High strength metal ensures the large capacity of loading 2 devices at the same . The mount can be used in a wide of applications, especially in stereo photography. The dual extension bracket is specially designed for supporting 2 piece of photographic equipment. Processed by anodization technique, the finish of the mount features wear and corrosion. The screw adapter allows you to install the extension bracket to tripod with 3/8 inch or 1/4 inch screw.