This gear set includes a replacement hook gear and hook drive gear. The kit contains part #163329 for the hook gear and part #163997 for the hook drive gear.
Fits Singer models: 620, 625, 628, 629, 630, 635, 636, 638, 639, 640, 645, 646, 648, 649, 1030, 1036, 1060, 1200, 2000, 2001, 2005, 2010, 417, 6700, 6704, 6705, 714, 717, 719, 724, 734, 737, 750, 755, 758, 770, 774, 775, 776, 778, 900, 920, 925, 935U, 2000, 2001, 2005, 2010.