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Commercial torsion spring available in 2-5/8" inside diameter. Made from oil-tempered steel for high-cycle commercial doors, the type used on warehouses, loading docks, and service bays that cycle dozens of times per day. This dual cone design keeps the spring centered on the shaft so tension stays even. These springs are not residential springs, they are heavier and wound differently. You will need your exact spring specs to order the right one: wire size, length, inside diameter, and whether it is left or right wound. Getting those numbers wrong means the door will not balance.