... design 4. MOQ: 1 set Spiral Stainless Steel Stairs -Spec.Dia.: Φ1200mm-1600mmHandrail: Φ38mm s.steel or PVC or 50mm woodBaluster: Φ25mm ... steel or Φ22mm steelRails: Φ8mm s.steel rodsCentral post: Φ133mm s.steel Treads: 15+15mm thickness, ... tempered glass Simple, steady, space-saving, and shiny staircase. It's the most fashion choise ...