Rorolling shutter door spring steel strip manufacturer High Carbon blue C75 steel strip spring coil. Larg quantity stock ready to ship! JIA XIAO MTC is dedicated to the research and development of steel strip heat treatment technology, ensuring the production of stable and high-quality heat treatment steel strip products, as well as offering customized heat treatment services to our customers. We understand that the needs of each customer are unique. Therefore, we provide personalized customization services. Whether you need special combinations of width, thickness, and materials, or specific