Photographic Softbox Soft Box Speed Ring Speedring Adapter For ElinchromThis Elinchrom speedring is specifically designed for your strobe light to fit standard softboxes both rectangular and octagon boxes. It has a outer diameter of 7 5/8" (19mm), fits 1/4" (6mm-7mm) standard rods. It fits all Elinchrom Strobe.Features of Photographic Softbox Soft ..