Given the extreme conditions of nature, exterior installations require tougher solutions. Aluminum is a lightweight, yet durable metal that naturally will resist rust. Therefore it is an ideal material for an exterior stair, one that will minimize the effects of nature. In addition to the inherent properties of aluminum, we go an extra step to increase the stairs longevity with our “Factory-finish.” The finishing process is called powder coating and is considered to be a very durable, high quality finish. The factory-finished stair is available in white and Black. With maintenance-free in mind, our aluminum spiral stair is perfect for all exterior situations such as patios, decks, and hard-to-reach rooftop overlooks.