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19w4 Hot dip galvanized heavy steel grating steel grating walkway Product Parameters 1 Bearing bar: 25x3, 25x4, 30x3, 30x4, 30x5, 32x5, 40x5, 50x5, ...75x10mm 2 Bear bar pitch: 12.5, 15, 20, 23.85, 25...