Package includes: 12pcs Extension Spring with hook ends Offering great tension and flexibility, these Spring is builted to bear heavy duty use Tension Spring can be used in many occasions, such as production and assembly, experiment, research and development, maintenance, Home Repair Make of highly elastic and fatigue resistant spring steel materials, ensuring long terms and resistance to wear and tear With double hook, which can be better fixed on the mechanical equipment to ensures the stable operate of the equipment These tension Spring consistent and stable stretching force, great for applications requiring controlled tension or resistance, Manufacturer: Kaeltsyn