Fotodiox 10SBXBW2436 Fotodiox Pro Softbox, 24-Inchx36-Inch (24x36 in) with Speedring for Bowens Gemini Standard, Classica Powerpack, R Series, Rx Series and Pro Series Strobe Flash Light, SoftBox, Speed Ring - Black
The Fotodiox dedicated 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", fits 1/4" standard rods. It fits all Bowens Strobes.