1.steel grade:20B,40B,45B,50B 2.standard:AISI,ASTM,BS,DIN,GB,JIS 3.size:2mm-150mm 4.usage:auto,railway ... profession engineers of high strength steel wire,and five QC to keep the products good quality so that in overseas marketing ... grade :20B,40B,45B,50B,45Cr,50Cr,55Cr.2.Standard:AISI,ASTM,BS,DIN,GB,JIS.3.Size:2mm-150mm.