... price 1. Product Name: 3.5mm Spring Of Grade 452. Material: Steel GradeGB StandardCarbon%Silicon%Manganese%Phosphorus%Sulphur %Chromium%Nickel%Cuprum%45#0.44-0.460 ... .2mm,4.5mm,5mm,5.5mm,6mm,6.5mm,7mm,8mm,9mm,10mm,11mm,12mm.Our Factory And Office BuildingMachine Of Our FactoryOur Spring Products 3.5mm Spring Of Grade 45(45#,60 ...