Automatic Door Shutter is made of commercial-grade aluminum alloy, operates on springs, and closes completely automatically. Ideal for usage in the house, light office, sheds, ranches, and home offices. The door closer is composed of the highest-quality aluminum and is zinc-coated to prevent rust. It is very effective and safe to use. Automatic Door Shutter is adjustable for all sorts of medium doors, including wood or metal doors, residential and commercial doors, and exterior/interior door closers. This is very cost effective in nature.