Wire Diameter: 1mm/0.04"; Outer Diameter: 10mm/0.39"(OD); Free Length: 60mm/2.34"; Total Length: 120mm/4.72" Dry to the touch oil finish for added corrosion resistance.Heat tempered spring steel Tension spring can be used in many occasions, such as production and assembly, experiment, research and development, maintenance, etc. Applications: Furniture, appliances, work, gate, screen doors and repair projects Package Content : 3 x Extension Spring