Listing is for 1 High Quality Hook Drive Gear (no shaft included) that fits many newer Home Sewing Machines and/or Embroidery and/or Sergers included but not limited to the list below Part # 53741 The gear's ID is about 7.90mm (5/16"), and it has 24 angled teeth fits: BERNETTE - 320, 330, 410, 420, 430, 440 RICCAR - 1900, 1925, 2600, 2800, 2900, 2950, 3400, 3500, 3600, 4001, 4003, 414, 500, 515, 525, 555FA, 570, 571, 581, 591, 606, 666FA, 805, 806, 807, 808, 8400, 8500, 888, 906E, 9150, 9160, 9600, 9700, 9800, 9900, R650, R750, R916