Singer Touch & Sew Bobbins 163131, 2pk Fits Singer models 290C, 600, 603, 604, 620, 620E31, 625, 626, 628, 629, 630E, 635, 635E3, 635E6, 635E7, 636, 638, 639, 640E, 645, 646, 649, 737, 750, 755, 756, 758, 770, 775, 778, 1040G and 1060.