Round-based iron spiral stair with steel structure.

Semi-gloss glazed structure, RAL 9001 finish, cream white.

Helix central pole with no visible screws.

External strip with no visible screws.

Durmast solid wood  tread with steel outer frame, finish from sample.

AIR5C banister: 4 satin-finish stainless steel rails, steel handrail, spindles with steel double plate.