Using this Deltana 4 - Inch Solid Brass Number 4 is easy. You can install it on your home's entrance, office door, or mailbox using appropriate tools. Just make sure to place it in a visible spot. As for maintenance, you can clean it with a soft cloth to keep its shine. Avoid using harsh chemicals as they might damage the brass finish. If it gets dirty, a mild soap and water solution can do the trick. Also, be careful during installation to prevent any scratches on the number. With proper care, this number will serve you well for a long time.