1.20 years'experience in spring 2.Certified by ISO/TS16949 3.Material: 60 Si2Mn, 55CrSi 4.Cold coiled by automatic machine Wire Diameter: 0.2 mm to 10 mmMany configurations done on automatic high speed equipmentVarious materials, tensile strengths, and shapes.Performance::1) Our precise interpretation and production of suspension coil springs to OEM standards, assure that our customers will enjoy ...