Fotodiox Softbox Speedring (Insert and Base Plate) for Norman Series 900, LH2000, LH2400, IL2500 Illuminator Strobe Light All Metal Design, fits standard 1/4" (6mm -7mm)rods. Standard Speedring for Rectangular or Octagon box Rotation Ring with thumb screw lock Smooth surface for effortless mount 24 Month Manufacture Warranty