... *41mm back to back 41*41mm, 41*62mm,41*82mm,and so on2)Thickness:1.5mm, 1.8mm,1.9mm,2 ... .0mm, 2.3mm,2.5mm ,2.7mm,3)Length:10 and 20 feet(3m,5.8m,6m ),special length are available ... )Holes:28*14mm,18*9mm,30*33mm etc5)Material :Carbon steel or SS304 or SS3166)Surface Treatment:HDG(hot dipped galvanized ...