1, ISO/TS16949:2002 ISO9001:2000 Certificate 2, High quality 3, Competitive price 4, Deliver fast Product description:Cylinder material: Steel, SS304, SS316, AlloyShaft material: Steel, SS304, SS316Cylinder finishing: Black (Autophoretic from Germany Henkel), Silver or other colorShaft finishing: Black (Nitriding), SilverSalt spray time: achieving more than 100 hours.Fatigue test: decay less than ...