Bearing bar pitch:30,40,60mm Cross bar pitch;50,100mm Plain,Serrated,I-shape,IS- ... , 32 x 5 x 3, 38 x 5 x 3, 40 x 5 x 3, 50 x 5 x 3, 50 ... etc, also be according to client's requirement and 30, 40, 60mm are recommended, America standard is available < 1'' x 3/16 ...