The Calumet Quick Ring is designed to make the assembly of any soft box or Calumet 3-D reflector easier than ever. The Quick Ring is made from all metal construction, & the lock lever will remain secure during normal use. The advanced design allows the center ring to be released & rotated, which relieves tension of the support rods as the box is being assembled. Simply unlock the center ring, insert all four rods in to the speedring, then lock the center ring back in place. The softbox is now assembled & ready to use. ** Optional center adapter ring is required for softbox use. Manual: Click here to read the manual for RM6400.