An Extension Spring is a helical wound spring that is designed to create tension and provide resistance to a pulling force. Extension springs are typically attached at both ends to other components and when these components move apart, the spring tries to bring them back together again. It is typically made up of materials such as high-carbon spring steel, and stainless steel to ensure strength and withstand high operating conditions.Attributes:• Able to get extended and retracted without getting tangled or twisted• Manufactured precisely to exact dimensions and tolerances to give improved durabilityApplications:An Extension Spring is used to store and release energy which helps with the opening and closing of the Engine Hood.