This is a Gary Fong Lightsphere Collapsible Adapter Ring I designed to attach the ChromeDome to the Lightsphere Collapsible. Without this adapter ring, those two Gary Fong products are incompatible. This unique design locks into the existing tabs on the ChromeDome.
Once this ring locks into the Chrome dome, it allows the Lightsphere Collapsible to securely connect to the protruding lip.