Using the Deltana Heavy - Duty 4 x 4 Square Door Hinge is easy. First, make sure the door and frame are clean and dry. Use the #12 x 1 - inch wood screws to attach the hinge to the door, and the #12 x 1/2 - inch machine screws for the frame. Make sure the screws are tightened properly for a secure fit. As for maintenance, you can wipe the hinge with a dry cloth regularly to keep it clean. Avoid using abrasive cleaners as they may damage the finish. If you notice any looseness, check the screws and tighten them if needed. This hinge is designed to last, but proper care will ensure it performs well for a long time.