... the eight profession engineers of high strength steel wire,and five QC to keep the products good quality so that in overseas marketing ... good reputation for 10 years ,next we introduce the products as follows: 1.Steel grade: SAE9254,,SUP120,,5Cr3,52100,SUP7,38CrMoAL,SUP6 ... Tensile strength:1030-2200MPA for high strength steel . 4.Diameter tolerrance:+/-0.04mm for below,and above 10mm +/-0.05mm. 5. ...