steel frame lattice Bearing bar pitch:30,40,60mm Cross bar pitch;50,100mm Plain,Serrated,I- ... shape,IS-shape Hot-dipped gal Steel frame latticeWe ... is 20 x 3 to 100 x 10; The specification of I-section type is 25 x 5 x 3, 32 x 5 x 3, 38 x 5 x ... x 7 x 4, 70 x 7 x 4, 75 x 7 x 4, etc.2) Bearing Bar Pitch (center to center): 12.5, 15, 25, 30, 30 ...