3.2m Armco Barrier Beam Galvanised Steel (3mm)This Armco barrier beam has a 3. 2m effective length, this is the distance between the post fixings at its extremities. The overall total length is slightly longer at 3. 5m, this includes the 150mm that overhangs past the mounting point at either end. For more information on how to take the effective length into account when planning your Armco install please see our guide on the Armco Beam Category. This is the longer version of the 1. 6m beam that