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since 1896, duer/carolina coil, inc. has been committed to exceptional customer service, high product quality, and continuous technical advancement. we specialize in the manufacture of hot and cold wound springs and work with material sizes ranging from .250 in. wire to 3 1/8 in. bar. with our years of experience, we can respond to your needs quickly and effectively while still supplying you with the highest quality springs possible. when you work with us, you will know you are working with a world leader in spring manufacturing and technology.