If you're looking for a way to add natural light into your container, but are worried about the security of your valuables inside, the security window is a great option for your shipping container. These security windows are placed high on the container to stop any would be thieves from breaking in. They are made of 1/4" thick clear plexiglass to avoid vandalism and glass breakage. You will be amazed at how much light one or two of these security windows can add to the inside of your shipping container. They can be placed anywhere on the container, but we recommend the back of the container for optimal light.