... a professional company that producting of steel gratings.Our steel gratings can be used for platforms, sidewalks, billboards,walkways,stairway ... We are going to expand our market.Grating Dimension Bearing bar pitch(mm)12.5, 15,25, 30, 30 ... 41.25, 45, 50, 60, 60.32, 80, 100Cross bar pith(mm)38, 50, 76, 100, 101.6Thickness(mm) ... backing chambers……The Red font is recommended . steel stair for Plateform