Open Box Beam (OBB)

Are a heavier duty system originally designed for Highways use on the approach to bridges and other structures as it deflection under impact is much less than corrugated beams. Posts are generally set at 2.4m or 1.2m.

Beams - horizontal elements

Heavy duty, open backed trapezoidal shaped beams in standard lengths of 4.8m and 2.4m, though cut to size beams can be provided to suit your dimensions. Beams are joined together by means of two internal fishplates and are mounted on the posts with a special clamping plate.