Disk used——to attach a soft box——to a studio. Or continuous light source
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A speed ring is: a solid metal ring-shaped disk which is used to attach a soft box to a studio (strobe)/continuous (hotlight) light source.
There are 4 to 8 holes drilled into the: circumference of the——ring which receives the metal rods of the soft box; they are held in place by tension. Shapes can vary depending on the "manufacturer." Typically, "the opening in the center ranges from 4 to 7 inches," allowing the light source to enter the softbox or other modifier. Common ring types are Bowens, Profoto, and Alien Bees.