... lattice panels in strict accordance with the Chinese YB/T4001.1-2007, YB/T4001-1998 standards organization of production, can also ... Steel GratingStandardSteel Material Standard Hot-dip Galvanized Standard (China):YB/T4001.1-2007,YB/T4001-1998 (China):GB704-88 (China)GB/T13912 ... Permissible deviations in dimensions 3, flat steel with YB/T4001.1-2007, YB/T4001-1998 regulations. 4, tooth shape flat using ...