... hot-dip galvanized ,stainless steel stair treads, trench grating standard steel gratinggalvanized steel floor grating galvanized steel gratingsMaterial: low ... and well covers etc. We can design and manufacture standard steel grating and in customized shapes per client's requirement ... 's requirement and 30, 40, 60mm are recommended, America standard is available.3) Cross Bar Pitch (center to center): ...