... highway, sewage treatment plant, waterworks, mine, steel, petrochemical, wharf and airport etc. 1) Steel grating: Bearing bar size 32×5mm, ... on site.3) Enclosure Form: B indicates steel grating enclosure and short-form shows no enclosure.4) Surface Treatment ... 40,50mmCross bar pitch38,50,80,100mmmaterialLow carbon steel, stainless steel, aluminumSurface treatmentUntreated, hot galvanized, painted