... 30days 4.Availability:20,000tons/year Wanjie ball-joint handrails are well featured by attractive appearance, easy installation ... surface treatment. Application: widely used for Power plants, chemical plants, oil refineries, steel mills, paper mills, mechanic plants, ... 1000,1200,1500,2000mm.4.Steel tube's size:subject to the design drawings confirmed by both parties. steel handrails for stairs