Mounting bracket for easy and space-saving installation of the junction boxes in parapet ducts to comply with the bending radii required for copper and fiber optic data cables. Mounting rail fastening, horizontal 50.0 mm, compatible with: GGK BR and BRA, double parapet duct GGK BR, Heidemann parapet duct, Gewiss Nowaplast series NP and comparable manufacturers, variants: 50.0 mm white, 50.0 mm white with separating shell, 52.0 mm black, 52.0 mm black with separating shell, 55.0 mm black, 55.0 mm black with separating shell