... .Such as pipe system installing and other structures. Detailed Description 1.Dimensions: 41 x 41mm or 41 x 21mm 2.Lengths ... *41mm, 41*62mm,41*82mm,and so on2)Thickness:1.5mm, 1.8mm,1.9mm,2.0mm, 2.3mm,2.5mm ,2.7mm ... struts with HDG/Electrical Galvanized/Pregalvanized/Seratted treatment Pregalvanized Strut Channel