Duo Corp Basement Windows are an essential addition to your home. It makes it easier for you to get fresh air below your home. That makes it especially useful for crafting and other projects. This vinyl basement window is simple to install. The glass is half an inch thick and is strong enough to hold up to regular use. It s highly insulated which makes the window set more energy efficient and can reduce the cost to heat or cool your house. The window slides open and closed easily. It includes a screen that lets you keep it open without allowing bugs and other critters into the house. Extruded 13/16 offset fin for use in single piece pourbuck or block installation.