scaffolding tube: 1. construction industry 2. water, gas, steam pipes 3. general & structural industry Out Diameter:38.1mm,42.3mm,48.3mm,48.6mmThickness:1.8mm-4.0mmSteel Grade:Q235B,Q345B,S235JR,S275JR,STK400/500Standard: BS1139-1775, EN39,EN10219; JIS G3444:2004Surface Finish: hot dipped galvanzied, electro galvanzied, black, painted, threaded, engraved hot dipped galvanzied scaffolding pipes