... Delivery:7-30days 4.Availability:20,000tons/year Wanjie ball-joint handrails are well featured by attractive appearance, easy ... widely used for Power plants, chemical plants, oil refineries, steel mills, paper mills, mechanic plants, cement plants, municipal ... .Steel tube's size:subject to the design drawings confirmed by both parties. steel ball-joint handrail & stanchions with base plate,steel ...