‍♂️The door closer hinges is made of stainless steel 304. Door closers will be suitable for indoor and outdoor use. ‍♂️The door closer integrates door slam stopper, door closer and door hinges. The door spring closer with automatic door closing, soft closing, door hinge function. ‍♂️You just 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 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. ideal for DIY installation or professional use, for fitting to interior residential and light commercial doors.