hot dipped galvanized Scaffolding Steel Pipe/tubes 1.standard:ASTM A53,BS1387,GB/T3091 2.OD:48.3-48.6mm 3.WT:1.5-3.5mm hot dipped galvanized Scaffolding Steel Pipe/tubes1. standard:ASTM A53,BS1387,GB/T30912.material:Q195,Q235,Q3453.OD:48.3mm4.WT:1.5-3.5mm5.surface treatment:black painted,oil,galvanized6.Application:construction.