... plain I type, serrated type, serrated I type; cross bar: round type and square twisted type. Grating Specification Load ... Bearing Flat Bar sizeThickness≥3mm, depth ≥19mm19X3,19X5,20X3, 20X5, 25X3, ... 34.8, 35.3, 40, 60, 80……Pitch of cross bars(mm)38.1, 50, 50.8, 70, 75, ... :+86-311-86043818Mob:+86-15203113087 galvanized steel bar grating weight