Automatic door closer

Automatic door closer, specifically a type of spring hinge. This hardware is designed to automatically close a door after it has been opened.
Key features and details include:
Functionality: It acts as a 3-in-1 device, combining a hinge, a spring closer, and often a 90-degree positioning door stopper function.
Mechanism: It uses a spring mechanism visible in the image to provide the force needed to pull the door shut automatically.
Material: These types of closers are typically made from durable materials like iron or thickened manganese steel to ensure a long service life.
Installation: They are designed for easy installation, often using screws to fix them in place, and can be used for both commercial and residential doors.