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Made-to-order torsion springs for self-storage and mini warehouse doors. These are built to your specific measurements in the USA and shipped once manufactured. Because they're custom, they can't be returned or exchanged, so get your measurements right the first time. Self-storage doors see a lot of cycles since tenants open and close them constantly, and these springs are built with that in mind. You'll need to know the wire size, inside diameter, and spring length when you order. Contact us if you're not sure about sizing. Standard residential torsion spring dimensions don't apply to mini warehouse doors.