... is 20 x 3 to 100 x 6; the specification of I-section type is 25 x 5 x 3, 32 x 5 x 3, 38 x 5 x ... 3, 40 x 5 x 3, 50 x 5 x 3, 50 x 7 x 4, 55 x 7 x 4, 60 x ... 7 x 4, 65 x ... 7 x 4, 70 x 7 x 4, 75 x 7 x 4, etc. 2) Bearing Bar Pitch (center to center): 15, 30, 40, 60, 80 ...