The Westcott 45" Round Halo is a softbox that mounts like an umbrella onto many different brands of pack-type strobe heads. No speed ring is required. The Halo is mounted by using the hook and loop tape opening and to partially open the frame. The light inside Halo and shaft of the umbrella inserted into its receptacle. The Light may be moved anywhere along the shaft for harder or softer effects before being tightened down for use.
Note: For Monolights see BH# WEHM (cat # 2026)
Mounts like an umbrella to your strobe head, softens in the same way as a softbox does