Martha Stewart picture rail hooks, set of 2These types of hooks were used in turn-of-the-century homes with plaster walls. Also popular in art galleries. My purpose was purely decorative. The "butterfly" hooks onto picture rail/molding or double/stacked crown molding (see pictures for example). Picture hangs from ribbon, wire, etc. that is secured to back of frame. Non-smoking home; pickup only; cash only Location: Decatur