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12 Gauge Steel Unistrut Channel 1)Size:41mm*21mm or 41mm*41mm back to back 41*41mm, 41*62mm,41*82mm,and so on 2)Thickness:1.5mm, 1.8mm,1.9mm,2.0mm, 2.3mm,2.5mm ,2.7mm 3)Length:10 and 20 feet(3m,5.8m...