Neewer Round Universal Collapsible Magnetic Ring Flash Diffuser Soft Box 45cm/18" for Macro and Portrait Photography Fits most DSLR's w/standard & telephoto lenses & flash combos Maximum diameter is 45cm, inner diameter is 13cm Turns your speedlite into a ring flash to get perfect lighting Comes with a thread for flash unit to fix and adjust width Skeleton is made of magnetic iron, easy to fold and carry