It is important for the functioning of many doors that an automatic door closing mechanism such as a door closer or floor spring is used. This is especially true for heavier doors, and a glass door is one example of this. Door closers ensure that a door is both opens and closes smoothly and securely. Door closers, such as the Dorma Porteo door closer, are sometimes called door tents as they assist in opening and closing the door. This ensures that a door always falls well into the hinge without you having to bother with it. They also help prevent glass doors from being damaged.