Used on the furniture, the material is 3mm carbon steel spring steel wire, stereotypes after the wound into type, the length of finished product is 85mm, electrophoretic paint anti-corrosion coating.
Technical Requirements:
1) Total number of coils: 17
2) Number of active coils: 15
3) Direction of rotation: right-handed
4) Diameter: 22
5) electrophoretic paint anti-corrosion coating
http://www.weiyuanspring.com/various-types-of-tension-springs-torsion/02