... civil architecture.2.Stair treadWelded or bolted fixing with checkered plate nosing or nonslip plate nosing3.GuardrailApplication: ... facilities,fire passage,water-supply and plumbing ,industrial platform,bridge and others.4.Steel ladderApplication:sewage disposal,waterworks ... ,overhaul access,passage for engine and boiler space,platform and so on.ItemNo.BearingBar PitchCrossBar PitchSpecification of ...