The rust resistant zinc coating of this hot dipped galvanized spiral stair kit makes it ideal for exterior applications. It includes everything you need for installation including all stainless steel fasteners, stainless dome center pole cap, easy-to-follow instructions, plus an installation video featuring Ed & Joe, "The Furniture Guys". The kit goes together quickly and easily, requiring no special skills or tools. The standard finish for the spiral kit is hot dipped galvanized.