1. We pass the ISO9001 Quality Control System Certificate 2. Our spring have enough intensity, flexibility and durability. 3. Its period of validity is one year. 4. The material is 60Si2MnA 5. Fatigue test 6. HRC: 46- 52 Degree 7. Wire diameter: 5- 50mm 8. Usage: Automotive\ Auto\ Car 9. Style: Coil 10. The materials and specification could be choosen by customers 11. We provide the excellent quality and the low price, the best service and punctual shipment. 12. Certain discount offered with large quantity. 13. The package could be choose by clients
