This is a Photoflex SC-B9010SFR Speed Ring for Photogenic and Norman Monolights is compatible with Photogenic Powerlight, Solair, StudioMax II and III Series Monolights and Norman ML-600, ML-400 and ML-400R Monolights. OctoDome rotating connectors are made from heat resistant cast aluminum alloy for durability, and they allow rotation while mounted to your fixture with your choice of any shaped softbox.