... Product: steel tube Surface: hot dip galvanized Outer ... diameter:38.1,42.3,48.3,48.6,60.3mm Thickness:1.8-4.0mm Standard:BS Product: steel ... tube /scaffolding tube/ steel pipeSurface: hot dip galvanized Outer diameter: ... ,S275JR,STK400/500Surface processing: hot dipped galvanized, electro galvanized, black, painted, threaded, engravedSpecification: ... galvanized steel tube