Abstract: A blind for a building opening, and having an upper blind roller, located in an upper region of the head rail, a lower blind attachment located in a lower region of the head rail, an upper blind stored on the upper blind roller, a lower blind stored on the lower blind attachment, a lower blind support wall, and a blind carriage mechanism thereon, for carrying vertical blind slats, so as to provide a head rail having a slim, aesthetically pleasing profile.