Description:1.Spring steel material,dual hook.2.Tension spring can be used in many occasions, such as production and assembly, experiment, research and development, maintenance, etc..3.Spring in the international market occupies an important position, are widely used, computers, electronics, automotive, and other field. Specification:Product Name: Tension SpringType:Dual hookFree Length: 80mm/3.1"Spring Size( Outer Diameter): 10mm/0.39"(OD)Wire Diameter: 1mm/0.04"Main Material: Spring SteelHeat treatment: TemperingFinished: Polished Package Content:4pcs x Compressed Spring