bicycle brake return spring, seat belt spring

 1. wire diameter: 8-18mm

2.material: carbon steel, alloy spring steel, music wire steel, and stainless steel etc

3. finish: after shot penning, black oxide, zinc/nicke/chrome plating, power coating, oiled to prevent rust, passivate etc

4. good quality, good hardness and long service life

5. these springs are made by CNC spring's machines