Spool caps are to help hold the spool in place, using friction to hold the thread spool and keep the thread tight, without the spool locking up or sticking, and from uncontrolably coming off the spool making a mess.
Fits Singer sewing machines
1020, 1021, 1022, 1030 Creative Touch, 1036, 1040G, 1411N, 1411U, 1425N, 1425U, 2001, 2001A, 2010 Futura, 2010 Touchtronic, 248 Fashion Mate, 5502, 5504, 5505, 5508, 5522, 5524, 5525, 5528, 600, 603, 604, 611, 625E1, 625E6, 625E7, 626E1, 626E6, 626E7, 628, 635, 635E3, 635E6, 635E7, 640 Touch & Sew, 640E, 646, 648, 650, 737, 750, 755, 756, 758, 770, 775, 778, 800, 834 Stylist, 838, 844, 900 Futura, 900-3, 920, 920-3, 935, Athena 2000 (2000A)
