... four kinds of steel gratings; They are Plain Style Steel Grating, Serrated Style Steel Grating, Plain I Type Steel Grating and Serrated I Type Steel Grating. They are widely ... 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 ... ) Bearing Bar Pitch (center to center): 12.5, 15, 25, 30, 30.16, 32.5, 34, 40, 41.25, 45, 50, 60 ...