Product: steel tube Surface: hot dip galvanized Outer diameter:38.1,42. ... 1.8-4.0mm Standard:BS Product: steel tube /scaffolding tube/ steel pipeSurface: hot dip galvanized Outer diameter:38.1,42.3, ... Grade: Q235B, Q345B,S235JR,S275JR,STK400/500Surface processing: hot dipped galvanized, electro galvanized, black, painted, threaded, engravedSpecification ... 0mm-4.0mm 0.3m-12m hot dip galvanized steel tube