... :6M,9m,12m 3>GB/T19001-2008/ISO9001:2008 4>size:50*25*3/4/5 1> Material : SS 400, ... 2> Length : 6 meter, 9 meter ,12 meter3> Chinese Standard size : 100*68*4.5mm-630*180*17mm4> European Standard ... size : 80*46*3.8mm-600*220*12mm5>Packing: bundles ... fancy.song1987Tangshan Qishuo Import & Export Trade Co.,LTD. I beam size for construction and building hot rolled