Using these Deltana 4x4 Solid Brass Square Knuckle Hinges is easy. First, make sure the door and the frame are clean and dry. Then, align the hinge with the door edge and the frame, and use the provided #10 x 1 wood screws to attach it firmly. For smooth operation, give the hinges a little test swing before fully tightening the screws. When it comes to maintenance, wipe the hinges with a soft, dry cloth regularly to keep them looking great. Avoid using abrasive cleaners as they can scratch the finish. If you notice any stiffness in the hinge movement, a small amount of lubricant can be applied. And always check the screws from time to time to ensure they're tight, so your doors stay in top shape.