Interior Stairs – Porcelain stoneware and steel open stair with open riser.
Double load-bearing running structure outside steps, semi-gloss lacquered steel, RAL 9001 finish, cream white.
Tread with 47-mm. thickness and  3-mm. porcelain stoneware cladding.
Travertine finish.
Tread fixed to the structures with soldered steel wings and recessed teeth with no visible screws