Steel grating: 1.Bearing bar pitch:30,40,60mm 2.Cross bar pitch;50,100mm 3.Best price Material:low-carbon ... cross bars(mm)38.1, 50, 50.8, 70, 75, 80, 100, 101.6, 102……Grating type: flat bar: plain type, plain I type ... , serrated type, serrated I type; cross bar: round type and square twisted type.Types of steel frame ...