... 3.Low cost. Back to Back c channel1)Standard: 41*41, 41*21,41x62,41x82...2)back to back: 41x41,41x62,41x82.. ... 3) thickness: 1.5mm~3mm.4) Length: according to customer's requirement ... Products are widely used in the world.Vendor to companies like ABB,Cooper etc. Our company ... applications. Our certificates: Our reference projects: Back to Back c channel