galvanized belt square tube for construction thin wall 1.size:20* ... .wallthickness:0.7mm-2.0mm thin wall galvanized belt square tube for construction1.size:20*20-100*100mm or ... recognized by our customers.Now we provide 300 series,400 series,200 series,900 series,colored sheets,coils,pipes and tubes,embossed sheets ... , No.118,Beihuan Road,Wuxi,China. galvanized belt square tube for construction thin wall