The door closer hinges are made of 304 stainless steel. The door closers will be suitable for both indoor and outdoor use. The door closer integrates door stopper, door closer and door hinges. The spring door closer with automatic door closing, soft closing, door hinge function. The door closer can reduce the noise interference generated when closing the door, close the door slowly to reduce the damage to the door caused by violent impact, and can prevent you from forgetting to close the door. You only need to replace the door hinges with door closer hinges and adjust the closing speed, the work is simple. You don't need to understand complicated drawings, it will be a simple and smooth installation. The automatic closer is suitable for right and left open door, wood, metal door, residential and commercial door, exterior/interior door closer, fire door, hotel, condominium, apartment complex, warehouse.