Each Norman barn door unit has four fully adjustable metal barn door wings, mounted on a sturdy frame assembly that snaps over the lip of reflector. The design allows a full 360 degree rotation of the barn door assembly on reflector rim. Top and bottom wings are trapezoid shaped to allow a tighter positioning of the wings for maximum light control. Norman Filter Frames fit easily into the framework of the barn doors to hold filters and gels flat.Four-wing. Fits all 5" diameter reflectors.