... Such as steel mill black and hot dip Galvanizind steel grating,flooring walkway,platform,stair tread,well cover,trench cover,checkered gratings ... 100 x 10,the specification of Isection type is 25 x 5 x 3, 32 x 5 x 3 ... ) Bearing Bar Pitch (center to center):12.5, 15,25, 30, 30.16, 32.5, 34, 40, 41 ... , 60mm are recommended, 3) Cross Bar Pitch (center to center):38, 50, 76, 100, 101.6mm etc, and 50, 100mmare ...