channel steel C Purlin , Z Purlin 1)Pregalvanized,Hot-dip galvanized and so on 2)Applied in building engineering channel steelC Purlin 1)Pregalvanized, ... engineering 1.good quality and price 2.quick construction 3.reliable bearing 4.beautiful apperance...c purlin, material could be ... Q195 Q235 and so on, any size can be ...