This black 5" Boomerang Bracket Adapter from ProMediaGear is designed for Profoto B1 and B2, Broncolor, and Elinchrom heads. The adapter mounts with a 1/4"-20 standard screw to the boomerang flash bracket and features a 1/4"-20 hole on top for added convenience. Channel grooves in the boomerang shoe ensure stability and anti-rotation while in use.