For use where architectural quality is not required, these plug-ins create stairs useful for games and other low-polygon applications.
Railings are not provided, but games usually do not require railings.
Optional Curtains are provided with the linear stairs to fill between the treads and the floor.
As you can see, submaterial ids are set for the various surfaces of the stair objects.
Stair Rollouts
Linear Stairs
Spiral Stairs
Circular Stairs
See TurboSquid
for these scripts.