The Exterior Zinc Spiral Staircase is a budget-friendly choice for outdoor stairs, featuring perforated steel plate steps, vertical steel spindle balustrades, and a nylon handrail. Its kit design lets you adjust risers and rotation during assembly for great flexibility. You can choose from three diameters, and the steel is always fully galvanised. For the finish, go with the classic galvanised look or add a black or white powder coating to better match your surroundings.