This is a Octabank Speed Ring for the JTL monolights also for, the Bowens Esprit 250 and 500, Prolite 82, 100 and 120, Travelite 250, 750, Travelite Voyager and Impact VS160 and VS300 Monolights. It also fits the Impact VS160 and VS300 Monolights.
The JTL Octobank connector is made from heat resistant cast aluminum for durability. They allow full rotation of any shaped softbox while it is mounted to your flash head.