Wood and steel spiral staircase for small space

Wood and steel spiral staircase for small space
Description
Wood and steel spiral staircase for small space

Specification: 
Center post 76*4mm in carbon steel
Stringer 114*4mm in carbon steel
Stair tread 40mm thickness solid wood tread
Tread support 6mm thickness tread support in carbon steel
Railing # height 36''/42''/1000mm
Baluster 42mm in cabon steel
Solid Rod 8 layers, 8mm solid rod in sus304
Top handrail 48mm in solid wood

Solid wood stair tread options:


Color for the stairs tread can be customized.
Below are some regular color for reference and choose: