Using your Deltana 4 - inch by 4 - inch hinge is easy. First, make sure the door and frame are clean and free of debris. Then, position the hinge on the door and frame as per your requirements and use the provided #10 x 1 - 1/4 inches wood screws to attach it. Tighten the screws firmly but don't over - tighten as it may damage the hinge or the wood. For residential use, this hinge can be used on interior or exterior doors. In commercial settings, it's great for offices, stores, and other public areas. When it comes to maintenance, wipe the hinge with a soft, dry cloth regularly to keep it looking good. If it gets dirty, you can use a mild soap and water solution. Rinse it thoroughly and dry it right away. Avoid using abrasive cleaners as they can scratch the finish. Check the screws periodically to ensure they're tight. If you notice any issues with the hinge's operation, such as squeaking or sticking, you can apply a small amount of lubricant to the moving parts.