Elegant steel spiral stairs:Technical specification: 1)treads:length 700mm-1000mm thickness 50mm-200mm 2)going:160mm-200mm 3)baluster:diameter 20mm-50mm high 800mm-1200mm Material:stainless steel rods with white paint 4)handrail:diameter 50mm-100mm Material:stainless steel rods with black paint 5)newel post:diameter 100mm-200mm Material:stainless steel post Feature: 1)Shape optional:Covered ,such as L/U/Z/C/S2) Colours and Measures can be changed for customers.It's possible to change the Materials ,finishes,balusters,etc.3)Main Material:stainless steel+PVC 4)Ease of Installation with Instruction provided. If you want to know more details,please feel free to contact us.