Rintal Exterior Zink Extra Step Kit for Outdoor Spiral Staircase

Adds one galvanized step with vertical metal tube balusters (no handrail) to a Rintal Exterior Zink spiral staircase kit, for floor-to-floor heights above the 13-step range. Up to three extra steps take the stair to 16 steps and 12' ⅞"; a center post extension is required above 10' 5⅝". Sold separately from the stair kit; order in the same diameter and finish.