... as Trafficable Drain grates and stairtreads.Bearing bar pitches maybe 12.5,15,25,30,40,50,60,80mm,of ... and 100mm are recommond.Type of bearing bar can be plain,serratted and I-bars.Grating Dimension Bearing bar pitch(mm ... )12.5, 15,25, 30, 30.16, 32.5, 34, 40 ... grates,fences,framedgrates,trash rack grates ,paint backing chambers…… plain steel grating