... European standard 3.length is 6m---12m. hot rolled channel steel Grade: Q235B, SS400, Q235, Q345, ... supply high quality Channel steel with reasonable price. Including Chinese standard, Japanese standard and so on.Material: ... etc. Standard: GB/JIS/EN/ASTM/DIN and others. Packing: In Bundle,Fasten by wire ... 6meter, 9meter, 12meterChinese standard size: 50*37*4.5mm -400*104*14.5mm Japanese standard size: ...