ISO9001 steel grating Material:Q235 Plain or Serrated Steel Bar:25x5, ... 100 x 10;the specification of I-section type is 25 x 5 x 3, 32 x 5 x 3, 38 ... .(2) Bearing Bar Pitch (center to center): 12.5, 15,25, 30, 30.16, 32.5, 34, 40, 41 ... .25, 45, 50, 60, 60.32, 80, 100 mm etc, also ...