... Thickness:1.8-4.0mm Standard:BS Product: steel tube /scaffolding tube/ steel pipeSurface: hot dip galvanized Outer diameter:38.1,42.3,48.3, ... JISG3444:2004Steel Grade: Q235B, Q345B,S235JR,S275JR,STK400/500Surface processing: hot dipped galvanized, electro galvanized, black, painted, threaded, engravedSpecification: Outer Diameter(mm) Wall ... 12m 60.3mm 2.0mm-4.0mm 0.3m-12m hot dip galvanized steel tube