The 9.5" Modular Speed Ring from Chimera is designed for the Video Pro series lightbanks, and the poles go into the angled pole blocks for a snug fit.
The aluminum ring goes onto the fixture's barndoors or slides into the accessory tray and keeps the lightbank in place. As an added feature, the pole blocks can be changed to accept Lantern, OctaPlus, and Daylite Junior banks.
UPC: 845077092028