4.8m Open Box Beam Barrier Rail Galvanised SteelThis heavy duty open box beam barrier is a great alternative to the standard corrugated Armco beam it connects together with fish plates and is hung onto the very same posts as the rest of our Armco barrier range using mounting plates. The benefit of this mounting method is that you are not restricted to using mounting points at exact predetermined intervals. Although we recommend setting mounting points at 1. 2m intervals, the mounting plates allow