U channel material:Q235,SS400,S235JR,ST37-2 size:50*37*4.5mm-400*104*14.5mm length:6m,9m,12m U channel1.Material:Q235 ... ,Q195,Q345,SS400,ASTMA362.Standard:GB,ASTM,DIN,JIS,BS 3.Thickness:4.5-14.5mm 4.Size ... #3601001359.11840A#4001001058.92840B#40010212.565.20840C#40010414.571.488 U channel