... ,tair tread ,fence ,pavement gratingType:W--welded steel grating L-- pressure-locked C-- socket-weldingBearing bar centers:15-30, 40, 60, 80 ... ,smooth surfaceVentilation,lighting, cooling, explosion-proof, non-slip performance;Standard type: 1m×6m(special sizes are available)Material:Carbon SteelSurface Treatment ...