High-Quality Materials: Automatic door closer is made of zinc alloy, using a one-piece molding process and a multi-pass assembly process to make the whole product strong and durable. Safety Protection: Groom door closer the door closing force can be adjusted to protect the door frame and door body, and avoid damage caused by forced closing through the buffer effect. Very Practical: It can withstand a door weight of 66.13 to 132.27 lb, the door spring can not only close the door automatically. It also reduces the force when closing the door, thus protecting the door from damage and reducing noise. Easy to Use: Adjustable spring hydraulic door closer hinge particularly easy to assemble by tightening with the provided screws, just install and screw between the door frames, efficient and convenient. Application: Door closers are suitable for homes, offices, hotel rooms, interior and exterior wooden and aluminum doors, can be installed on both left and right doors.