Product Description: Set of 6 pc. Top Quality No-Back-Lash Bobbin Case for Industrial Single Needle Sewing Machines Compatibility: Will not fit Walking Foots Description: This set includes six top-quality No-Back-Lash (NBL) bobbin cases, specifically designed for industrial single needle sewing machines. These bobbin cases are equipped with a brake spring that applies constant, light pressure on the bobbins, preventing the bobbin thread from unraveling or tangling when sewing operations start and stop. Key Features: Quantity: Set of 6 bobbin cases Bobbin Case Number: 52237-NBL (also sold under various other numbers including 110-38759, 112035-000, 148350-101, 2110604-301B, 52237NBL, 540735, BC-DB1-NBL, D1837-555-BAA, K1837-000, MF41E0125, S03245-001, SC31-NS) Design: No-Back-Lash (NBL) design with brake spring Functionality: Brake spring ensures constant light pressure on bobbins to prevent momentum, allowing bobbins to stop spinning faster and preventing thread unraveling or tangling. Compatibility: Fits many industrial single needle sewing machines Standard Size: These parts are standard size for 90% of all industrial sewing work Additional Information: High Quality: Made from top-quality materials to ensure durability and reliability Efficiency: Enhances sewing efficiency by reducing thread waste and preventing sewing interruptions due to bobbin thread issues These No-Back-Lash bobbin cases are essential for maintaining smooth and efficient sewing operations in industrial settings, making them a valuable addition to your sewing machine accessories.