B008CBCAL6 Fotodiox Pro 36″ Octagon Softbox PLUS Grid (Eggcrate) for Studio Strobe/Flash with Soft Diffuser and Dedicated Speedring, for Novatron M Series Monolight M150, M300, M500, Bare Tube Head 2107FC Strobe Flash Light

Make sure this fitsby entering your model number.
Pro Grade, Heat Resistant Premium Grade Materials w/ Heavy Duty Construction
Features Inner Baffle and Outer Diffusive Cover for Even Light Throw
Sealable Venting for use with Continuous Lighting, Rotating Speeding with Thumb Screw Lock
Lightweight eggcrate design grid, 50 degree angle, produce controled light source
Each grid is 2″x2″ and 1.5″ deep, Each size adjustable by collapsing cells