... ISO 9001:2008 Precision steel tube for shock absorber DescriptionDetails Precision steel tube for shock absorber Out Diameter18mm-121mm(1/2'' - 16 ... ,20CrMo,16mn,ST35, ST37,ST37.4,ST45,ST52 and etc.TechnicalCold rolledCertificateISO 9001:2008Packing Export standard seaworthy packing ... for physical construction, hydraulic installation, auto parts,sleeves,and etc Precision steel tube for shock absorber