Studioking has a wide assortment softboxes and accessories, which can be mounted on various brands of flash units using a speed ring (adapter). this way you can save a considerable amount on the original softboxes of other brands. the outer diameter of this adapter is 15.4 cm, the inner diameter is 11.9 cm. Application studioking adapter ring sk-ec for elinchrom With the help of this adapter ring you can make inexpensive softboxes, snoots, reflectors or other accessories suitable for your elinchrom flash unit. these accessories must be equipped with an exchangeable adapter ring.