Door chains are small security devices that are attached to the inside of a door and serve to prevent the door from opening all the way. They are often used on doors that open outward, such as the front door of a house or apartment, as these doors are often exposed to more risk of break-in. Door chains come in various forms, such as a bar that is attached to a bracket on the ground or a hook that is attached to the door and rests on the floor.

Door chains are another type of security device that is used on doors. They consist of a chain that is attached to the inside of the door and is attached to a bracket on the wall or door frame. The door can only open a little bit when the chain is attached, which can help prevent someone from entering unwanted. Door chains are especially useful as additional security when the door is already locked with another lock, such as a cylinder lock or a multipoint lock.