Set of 2 brand new NBL (No-Back Lash) Bobbin Cases for most oscillating hook style home sewing machines including Babylock, Brother, Singer, Viking and many others. The bobbin Case #JO1313Z-NBL. These are No-Back-Lash bobbin case. These bobbin cases fit most home sewing machines using oscillating hook (shuttle hook). An oscillating hook is a sewing hook that moves back-and-forth when you turn the hand wheel several times. No-Back-Lash (NBL) bobbin cases are designed with a brake spring which puts constant, light pressure on bobbins to overcome momentum. Bobbins stop spinning faster, preventing unraveling or tangling of bobbin thread when sewing operations stop and start. Brand New High Quality Bobbin Case For Consew 146RB / 175RB Industrial Sewing Machines. Bobbin Case # 2130104-301A. This high quality bobbin case fits following Consew machines : 146RB, 175RB, 176 Also fits following sewing / Set of 2 brand new NBL (No-Back Lash) Bobbin Cases for most oscillating hook style home sewing machines including Babylock, Brother, Singer, Viking and many others. The bobbin Case #JO1313Z-NBL. These are No-Back-Lash bobbin case. These bobbin cases fit most home sewing machines using oscillating hook (shuttle hook). An oscillating hook is a sewing hook that moves back-and-forth when you turn the hand wheel several times. No-Back-Lash (NBL) bobbin cases are designed with a brake spring which puts constant, light pressure on bobbins to overcome momentum. Bobbins stop spinning faster, preventing unraveling or tangling of bobbin thread when sewing operations stop and start. These bobbin cases will fit most oscillating hook home sewing machines including : Babylock : B15, B17, B21, BL200, BL500, BL702, BL713, BL722, BL1000, BL1556, BL2160, BL22, BL 2200, BL2300, BL2400, BL2500, BL2600, BL2800, BL3500, BL500, BL5500 Set of 2 brand new NBL (No-Back Lash) Bobbin Cases for most oscillating hook style home sewing machines including Babylock, Brother, Singer, Viking and many others. The bobbin Case #JO1313Z-NBL. These are No-Back-Lash bobbin case. These bobbin cases fit most home sewing machines using oscillating hook (shuttle hook). An oscillating hook is a sewing hook that moves back-and-forth when you turn the hand wheel several times. No-Back-Lash (NBL) bobbin cases are designed with a brake spring which puts constant, light pressure on bobbins to overcome momentum. Bobbins stop spinning faster, preventing unraveling or tangling of bobbin thread when sewing operations stop and start. These bobbin cases will fit most oscillating hook home sewing machines including : Babylock : B15, B17, B21, BL200, BL500, BL702, BL713, BL722, BL1000