Round-based spiral stair with steel structure.

Structure painted with micaceous iron glaze, 609.0403 finish, onyx black.

Helix central pole with no visible screws.

External strip with no visible screws.

Durmast solid wood tread ,  natural coloured finish.

AIR7C banister: 6 satin-finish stainless steel rails, steel handrail, spindles with steel double plate.