... :0.2-1.8mm light steel keel,Export France, South America, Europe1,Size 38*38mm,40*35mm,50x35mm, 50x50mm, 75x35mm, 75x50mm ... ,70x35mm, 100x50mm,2,lenght 2000-15000mm,3,zinc 50-275g4,thickness 0.25-1.8mm5,4/10/12 ... and steel ceiling . Faced with plasterboard for decoration lEurope, South America light steel keel