Fotoconic 152mm/6 Inch Diameter Speed Ring Adapter Flange Speedring Softbox Soft Box For Bowens S Flash/Monolight 6" (152mm) flange that will fit any 6" Bowens compatible application 6" (152mm) diameter. Will not fit rings requiring 5.7" or any other size. 6" (152mm) size fits many interchangeable mount snoots / Beauty dishes / speed rings. All metal PLEASE MEASURE YOUR ITEM. 6" (152mm) EXACTLY.