galvanized belt square tube for construction thin wall 1.size:20 ... 2.wallthickness:0.7mm-2.0mm thin wall galvanized belt square tube for construction1.size:20*20-100*100mm ... ,pipes and tubes,embossed sheets,coils,pipes and tubes,patterned sheets/coils,import sheets/coils and antiskid sheets/coils. ... Steel Market, No.118,Beihuan Road,Wuxi,China. galvanized belt square tube for construction thin wall