We provide diffrence standard of Steel Channels (GB/ASTM/JIS/EN)
JIS Standard :50*25 to 250*90mm BS Standard(Taper Flange): 76*38 to 203*89mm BS Standard(Parallel Flange): 430*100 to 230*75mm GB Standard: 50 to 200mm ASTM Standard: 38*14.3 to 305*80mm