... , oil project, seaport, power plant, water plant, defense project, chemical factory etc. We produce three kinds of steel gratings, they are ... x 3, 32 x 5 x 3, 38 x 5 x 3, 40 x 5 x 3, 50 x 5 x 3, 50 x 7 x 4, 55 x 7 x 4, 60 x ... 7 x 4, 65 x ... /50G205/60/50G255/60/50 hot dip galvanized steel grating(factory)heav duty grating