... b.Top: Plain or serated c.4000 square meter/week Heavy duty welded steel gratingFlooring galvanized steel grating is the most ... ,30x5,32x5,40x5,50x5,.....75x10mm2Bear bar pitch12.5, 15, 20, 23.85, 25, 30, 30.16, 30.3, 34.3, 35 ... guarantee:Our products have got ISO9001 Quality Certificate.common specification: Heavy duty welded flooring galvanized steel grating