Clearly Secure Glass Block Windows come fully assembled to fit a variety of opening sizes and can enhance the comfort and appearance of any room. Glass block is a special building material made of real glass and laid similarly to brick or concrete block. For residential purposes glass block windows are commonly used as a basement replacement window but are also ideal for bathrooms, kitchens, sidelights, transoms, garages and much more. They are easily installed in any residential or commercial masonry opening and can also be used in wood frame openings. Clearly Secure Glass Block Windows are more difficult for thieves to penetrate and thus are considered a more secure alternative to traditional windows. Glass block windows are also considered more energy efficient when compared to single pane glass windows.