Using these Deltana 4 x 4 Square Hinges is easy. First, make sure the door and the frame are clean and dry. Then, position the hinge on the door and the frame using the pre - drilled holes and attach it with the included #12 x 1 - 1/4 wood screws. Tighten the screws firmly but don't over - tighten as it might damage the hinge or the wood. As for maintenance, wipe the hinges regularly with a soft, dry cloth to keep them looking good. If they get dirty, you can use a mild soap and water solution, then dry them thoroughly. Avoid using abrasive cleaners as they can scratch the finish. Also, check the screws periodically to ensure they're still tight. If you notice any looseness, just tighten them up. These hinges are built to last, but with proper care, they'll keep your doors swinging smoothly for years.