The StudioKing Adapter Ring SK-BW for Bowens is an adapter with which you can place inexpensive accessories, such as softboxes, snoots and reflectors from Falcon Eyes on flash units from brands such as Linkstar, Bowens, StudioKing, Jinbei, Qihe, Lastolite and Aurora. Using this adapter ring saves you costs on original, expensive softboxes. The outer size of the adapter ring is 15.4 cm.