... span,field geology,natural conditon,make the final design and prepare to productcross-arm-attachment boltwith the ... the warehouseflange-attachment boltfirstly make the majority of the pole, as the dimension requirement ,cut steel plate ... pole,flange and cross-arm togetherHJ431welding fluxhot dip galvanization and installationzincwhole quality monitor in the process Single-arm street steel light pole ...