Fotodiox Speedring, for Novatron M Series Monolight M150, M300, M500, Bare Tube Head 2107FC Strobe Flash Light, Speed Ring
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" (19mm), fits 1/4" (6mm-7mm) standard rods. It fits all newer Novatron Strobe.