... large-span bridges, gymnasiums and portable houses. Z steel purlin may be used in single spans and continuous spans ... DIN,JISPackagingPVC is free,we also can pack as you requestThicknessfrom 0.5mm to 15mmMaterialQ235,Q195, ... Q345Sizelength,width,thickness,height can manufacture as you requestSurface Treatmenthot dipped galvanized,electrogalvanizing,spray paintMateriaQ235 ...