Coil spring with a 525 lb spring rate. Made with chrome silicon with a 2-1/2" inner diameter and a 12" length. Available in a chrome plated or silver powder coated finish, QA1's 2.5'' I.D. Coil Springs are offered in 6'' to 14'' free length. QA1's springs are strong, consistent and have a long life because they are made with the highest quality materials. Made from chrome silicon steel, they are cold wound, heat treated and shot peened. Every spring goes through intensive manufacturing processes to ensure consistency, accuracy and durability. All QA1 springs are ground at both ends to ensure straight, consistent and accurate operation. They are either silver powder coated for excellent longevity, or are polished and chrome plated for the ultimate in appearance. Lengths and rates are clearly marked for quick and easy identification. All QA1 springs are lifetime guaranteed to remain within 2% of the original free height and rate under normal operating conditions.