This Speed Ring fits Dynalite, and several other flash heads. Before mounting it to Dynalite head, it is necessary to remove the black, rubber screw ends on the interior of the ring.
This ring also fits SP Systems SP90, 120, 920, 147, Britek, Medalite, Metz 32, 40, 50MZ, Photogenic PG4000, Profoto Propact, Studiomate, and Sunpak 622 Super flash heads.
This Speed Ring fits the Photoflex Litedome, Multidome, and Stripdome softboxes.