... 20,000tons/year bar steel gratingType:W--welded steel grating L-- pressure-locked C ... Quality System Certificate Bearing bar centers at 20mm: This kind of fine mesh steel ... walkway and ditch covers which require high security.Notes: common welding standard: single-side ... used for Belt corridor, storage shelf,Attic panel, trestle, guardrail, sunshade gate, etc. ... steel grate,steel fence,steel mesh grating