... gratingThe main categories of steel grating are: steel grating, plug-grating, stair stepping board, ditch cover, steel ladders, ... tree pool cover, working platforms, highway fence, railway fence, ... to 30, 40, 60, 80 and 90mm; of which 30 and 40mm are recommended 2) Cross bar ... High quality steel grating/stair,floor,trench grating