The Videolarm MR7 offers a low profile 7” dome that extends only 3.5” below the ceiling. The steel top will measure 5.5” (h) x 11” (d). The lower acrylic domeis free-blown using cell-cast tinted or clear acrylic (1 F-stop light reduction for tinted lower dome). The lower dome is held in place by a19-gauge steel trim ring (white powder coat finish). The MR7 is designed to be installed in either sheetrock or drop ceilings. Three rotatingsupport arms will allow for adjustment to the ceiling material thickness.