These speedring inserts have a 152mm (6") outer diameter. Available for Bowen, Paul C. Buff, Balcar, Profoto, Photogenic, Speedlights.
Convert softboxes with a 152mm (6") Speedring Insert to work with Bowen S Mount lights and flashes
Cheetah QuickSilver 24 inch Softbox
This GODOX S2 Bracket allows you to use your Bowens mount light modifiers with speedlights. You can save hundreds of dollars by not having to purchase light modifiers specifically for your speedlights.