These Handyman Single Loop Closed Extension Springs by Prime-Line Products are constructed of durable spring steel, and they come finished in a beautiful, corrosive-resistant, nickel-plated finish. Single loop closed end extension springs like these are used for a variety of household and professional applications. The outside diameters, lengths and gauge thicknesses vary between each of these springs, while their dependability does not. Use these springs for repairs around the house, in the office, vehicle, garage and in many other applications.