The Shadowline Masonry rail has been specially designed for use with plasterboard ceilings and masonry walls. The Shadowline rail is installed on a masonry wall during the building or renovation phase. The Shadowline profile disappears completely in the shadow line next to the ceiling panels, yet still offers all the advantages of a flexible hanging system: undamaged, clean walls and the flexibility to quickly and easily hang paintings and other wall decorations and move them around as desired.