Grade A quality, medium fits Babylock BL200, BL702, BL713, BL722, BL1000, BL1050, BL1108, BL1170, BL1400, BL1500, BL1550, BL1750, BL2100, BL2150, BL2200, BL2400, BL2800, BL3000, BL4000, BL5000, BL6000, BL6150, BL6600, BL7000, BL7500, BL8000, BL8500, BL9500, EM1, EM2, ESI, ESI2, Simplicity SL237, SL1170, SL1200, SL1220, SL1250, SL1270, SL2507, SL6220, SL8020, SL8130, SL8220, SL9000, SL9130, SL9150, SL9240, SEI, many Singer including 1591, 29mm x 15mm