Using these Deltana 4' x 4' Square Hinges is easy. First, make sure the door and the frame are clean and free of debris. Then, align the hinge with the pre - drilled holes on the door and the frame, and use the provided #12 x 1 - 1/4' wood screws to secure it. When opening and closing the door, the ball bearings will ensure smooth movement. As for maintenance, it's a good idea to wipe the hinges with a soft, dry cloth regularly to keep them looking good. Avoid using harsh chemicals or abrasive cleaners, as they can damage the finish. If you notice any looseness over time, simply tighten the screws. These hinges are built to last, but a little care will keep them in top shape for years.