Security & Privacy If you are worried about an intruder attempting to break in, or flying debris from a lawn mower, or even children losing control of their baseball-Glass Block it windows are an excellent choice. Glass Block it windows will give you added security compared to a standard single or even a double pane window. Glass Block it uses 3 inch glass which in turn makes it an excellent alternative to a standard pane window. This allows you to have comfort, security and piece of mind, while adding stylish decor. Glass block windows have a pattern to them resulting in less visibility from the outside, which creates more privacy for you. Lower Heating and Cooling Costs Glass Block windows will decrease your cooling and heating costs. Read more at www.GlassBlockIt.com