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DescriptionThis item is spiral springs that offer resistance to a tension force, or load, applied along the axis of the spring. When a load is placed on an extension spring, making it longer, the spring pulls back against the load to return to its original length. These springs are used in a variety of applications, including automotive engines, major appliances, medical devices, electronics, and sensitive measuring instruments.Features- Color: As pictures showed.- Material: galvanized steel.- Dimensions: Diameter 4 - 9.5mm/0.16-0.37 inch.- Length 10 - 79.5mm/0.39-3.13 inch.- Great resilience and for durable use.- Greater resistance to corrosion.- Used for automotive engines, major appliances, medical devices, electronics, and sensitive measuring instruments.