... mattres,shock absorbers 4.Best price 1. Product Name: 3.5mm Spring Of Grade 452. Material: Steel GradeGB StandardCarbon%Silicon%Manganese%Phosphorus ... .75mm,2.8mm,2.85mm,2.95mm,3mm,3.15mm,3.2mm,3.35mm,3.5mm,3.7mm,3.8mm,4mm,4.2mm,4.5mm,5mm ... Factory And Office BuildingMachine Of Our FactoryOur Spring Products 3.5mm Spring Of Grade 45(45#,60#,65#,C70DA,C82DA,70#,80 ...