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This heavy-duty Industrial Umbrella Model Bobbin Case from ADW CRAFT'S® is engineered for rigorous use in industrial sewing environments. Crafted with precision using industrial-grade steel, it is compatible with umbrella-type sewing machines used in factories, garment units, and high-speed commercial stitching.Enjoy a seamless sewing experience with a bobbin case that withstands long hours of continuous operation. The steel design ensures long life and high resistance to wear and tear. Every bobbin case is tested for tension accuracy and rotational smoothness to provide consistent stitches in high-speed operations.