... .Size: customized 3.Low cost. Back to Back c channel1)Standard: 41*41, 41*21,41x62,41x82...2)back to back: 41x41,41x62,41x82..3) thickness ... BSC-300 41mm 82mm 3000mm 2.5mmAny other model can be gotten from Besca.Ours have passed CE,NEMA,ISO,SGS ... more information: http://www.chinabesca.com Our service You can be assured that we provide good quality and fast, consistent, and ...