REDI2SET glass block windows are an ideal basement replacement window they also make great windows for bathrooms garages kitchens and entryways. Made of 100 real glass REDI2SET glass block windows are fully assembled for easy installation. Thick break-resistant glass enhances home security. Popular wavy glass pattern transmits light while maintaining moderate privacy. Provides improved energy efficiency over old single-pane basement windows. Efficient sound barrier reduces noise from outside and helps keep homes quiet. Assembled in the USA by 1 of Americas oldest glass block companies. Dryer vent option with standard 4-in opening makes it easy to hook up your clothes dryer exhaust hose. Rough openings should be 0. 5-in to 2-in larger than the actual window size.