Call sizes are nominal (rough opening) not including screw flange. Painted and embossed steel laminated to 7/16" gypsum board solid core. Extruded aluminum frame. Opens easily by removing screw and lifting ring at bottom.
For sink mounted faucets and exposed tub/ shower. Used on hot and cold sides with acrylic handles. On hot side only with lever handles. Used on cold side with lever handle only.