Channel steelSpecification:30c#??8c#??5c#??br />30b#??8b#??5b#??br />30a#??8a#??5a#??br />22#??0# 18#??6#22a#??0a# 18a#??6a#14b#??4a#Material:Q235AB,Q345A(16Mn),20#,08CuPVXt