CKPSMS Brand -"L Style" Bobbin CASE #52237 BC-DB1-NBL (No-Back-Lash) Spring Compatible with/Replacement for JUKI Brand Singer Brand CONSEW Brand

50PCS “L style” BOBBIN CASE #52237 OR BC-DB1-NBL (No Back Lash) SPRING . Compatible with/Replacement for JUKI brand SINGER brand CONSEW brand BROTHER brand AND most Industrial Single needle Straight Stitch Industrial sewing machine sewing machine. No-Back-Lash brake spring which puts constant , light pressure on bobbins to overcomemomentum. Bobbins stop spinning faster, preventing unraveling or tangling of bobbin thread when sewing operations stop and start.