Steel black spiral staircase with contemporary grid plate stair treads

Steel black spiral staircase with contemporary grid plate stair treads
Description
Steel black spiral staircase with contemporary grid plate stair treads

Specification: 
Center post 76*4mm in carbon steel
Stringer 114*4mm in carbon steel
Tread 6mm thickness tread in carbon steel
Railing # height 36''/42''/1000mm
Vertical tube 25mm in carbon steel
Top handrail 42mm in carbon steel

Stair tread options reference and can be customized as well: