ViaCon Culverts texts... HelCor Steel Zero Diameters: 200 mm – 3600 mm Corrugation types: from 68 x 13 mm Steel grade: from 250 MPa (Re)Find out more about HelCor HelCor + Steel Zero Diameters: 3600 mm - 4000 mm Diameters: 3600 mm - 4000 mm Steel grade: from 250 MPa (Re)Find out more about HelCor+ ViaPlate 200 Steel Zero Steel Zero Steel Zero Steel ZeroFind out more about ViaPlate 200