... 7.00mm Standard: GB18983-2003 Material: SAE1060, SAE1065, SAE1070, 60#, 65#, 65Mn, 70#, 72A, 72B, 80#, 82BDiameter: ... Carbon Steel Wire, Spring Steel Wire, High Carbon Spring Steel Wire, Carbon Steel Wire, Spring Wire2. Material:Steel GradeGB ... StandardCarbon%Silicon%Manganese%Phosphorus%Sulphur %Chromium%Nickel%Cuprum%60#0.60 ...