The speedring insert is a replacement part for Pro Studio Solution EZ-Pro Softboxes, Beauty Dishes or Pro Softboxes (with an existing speedring plate). By replacing the insert with a different model, you can mount the softbox on almost any strobe, allowing you to expand your lighting or use the same softboxes for multiple setups.Features. For Novatron FC-Series, M-Series, and Compatible - 7-3/4 Speedring & Insert For EZ-Pro Softboxes, Beauty Dishes and Standard Softboxes. Standard Speedring for Softboxes and Beauty Dishes. All metal interchangeable speedring insert. Insert has an outer diameter of 5-7/8. 24 Month WarrantyCompatible Strobes:. Novatron FC-Series. Novatron M-SeriesSpecifications. Handle: . Weight: 454 g