REDI2SET glass block windows are the 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. Soft textured ice glass pattern lets in light and affords a high degree of 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. Easy to maintain vinyl hopper style Fresh-Air vent wont peel rot or rust it features an easy to replace screen that keeps insects out. Rough openings should be 0. 5-in to 2-in larger than the actual window size.