... be used for: 1.Trench cover Application:city-road,plaza,landscape-gardening,dock,airport,parking-lot,highway,railway,industrial ... engineering and other civil architecture. 2.Stair tread Welded or bolted fixing with checkered plate nosing or nonslip plate ... and airport. 6.Fencing Application:electric power plant,railway,highway,sewage disposal plant,waterworks,mine plant,iron-works ...