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