... high quality Channel steel with reasonable price. Including Chinese standard, Japanese standard and so on. Material: SS400, ST37-2, A36, S235JRG1, Q235, Q345 ... etc. Length: 6meter, 9meter, 12meter Chinese standard size: 50*37*4 ... .5mm -400*104*14.5mm Japanese standard size: 50*25*3mm-300*90*13mm Founded in 2000, ...