This is a kit with pre-cut steps and a central dowel to make a spiral staircase with 16 steps (enough for a staircase from the first to second floor of the 2-Story Room Box French Quarter).
See the photo and links below for an idea by Laura Carson for adding a banister using table legs and wood trim (though the staircase can be used without this addition).
One kit with parts for 16 steps (makes a staircase 9-1/2" tall, with the final 1/2" of the 10" height of the room being the final step). Note: the dowel included is 12" long, so you can cut to fit or add additional steps from the Extra Steps for Spiral Staircase Kit.
Design Team Member Laura Carson made a Spiral Staircase (see the wide photo below). More info in the blog and/or see the supply list.