steel profile 1.Material: Q235 Q195 SS400 A36 2.. Length : 5-12m 3. Size 41x41,41x21mm C channel steel1.Material: Q235 Q195 SS400 A362.. Length : 5-12m3. Size 41x41,41x21 A)Size:41mm*21mm or 41mm*41mm back to back 41*41mm, 41*62mm,41*82mmB)Thickness:1.5mm, 2.0mm, 2.5mm ,2.7mm,3.0mmC)Length:10 and 20 feet(3m,5.8m,6m ),special length are available upon requestD)Holes:9*35mm,11*35mm,14*30mm etcE) ...