Unistrut P1001 Back-to-Back Channel is made of steel. It is an excellent solution for outdoor environments and has a unique metallurgical structure which gives outstanding resistance to mechanical damage in transport, erection and service. This product is available in plain or continuous slotted in multiple channel combinations and all have 2.5mm serrated lips. Combination channels manufactured from whilst hot-dip galvanised channel is continuously seam welded or spot welded as appropriate.