... serrated type bearing bar is 20 x 3 to 100 x 10;the specification of I-section type is 25 ... 60.32, 80, 100 mm etc, also be according to client's requirement and 30, 40, 60mm are recommended,America ... -4) and so on.>3) Cross Bar Pitch / center to center:38, 50, 76, 100, 101.6mm etc, also ... be according to client's requirement and 50, 100mm are recommended, America standard ...