Round-based iron spiral stair with steel structure.

Structure painted with micaceous iron glaze, 609.0402 finish, steel grey.

Central pole composed of turned cylinders for regular risers with no spacing rings.

Layered glass tread,  natural etched finish, with steel outer frame.

Upper step at 90° width , floor flushed.

AIR4C banister: 3 satin-finish stainless steel rails, steel handrail, spindles with steel double plate.