atlantis brand ceiling metal stud channel steel keel is based on thin-walled profile steel with thickness 0.5mm-1.5mm To high ... , high strength, stiffness, and ensured the construction of light steel keel excellent performance, the volume of two-sided galvanized ≥ ... , high strength, stiffness, and ensured the construction of light steel keel excellent performance, the volume of two-sided galvanized ≥ ...