channel steel Grade:GB/EN/ASTM/JIS Standard Material:A36,SS400,Q235,Q345,ST37,ST52 U-ChannelThe feature of channel:1)Production Specification:GB/EN/JIS Standard2)Size:GB Standard 50-320mm;EN Standard 30-400mm;JIS Standard 50-250mm.3)Treatment:Hot rolled,Hot dip galvanized and painted.4)We can supply any length as per your request.