This single, double-hung window is sized to fit the standard 3/8 wall with 2-1/2" x 4-15/16" opening. It offers working trouble-free sashes and includes all of the extras: brass plated handle pulls, brass plated lock, clear glazing (removable for cleaning and painting) and interior and exterior casing. They are molded in white, high-impact polystyrene to eliminate tedious sanding and painting."