1.ISO9001:2008 quality systems 2.4 running lines. 3. Delivery:7-30days 4.Availability:20,000tons/year pavement gratingUnique features:Light weight, heavy-duty, large loading-bearing capacity, economical, ventilated,modern- styled, attractive appearance, non-slip and safe, easy to clean and installation, durable etc.Application:sidewalk, pavement, floor, structure paltformType:W--welded steel ...