A floor spring door closer is a type of door closer used to open and close doors. It consists of a floor spring attached to the door and a fixed attachment to the frame or wall. When the door is opened, the floor spring moves and stays in that position until the door is closed again. Floor spring door closers are often made of steel or aluminum and are designed to be strong and durable. They are often used on doors that need to be automatically opened, such as in shopping centers or airports, to prevent people from having to open the door manually.