Arch Revolution Patented ANTI-SLIDE,QUICK-WINDING BOBBINS.

Fits for Most Singer® 15 Class models:
15-125,15-30,15-86,15-87,15-88,15-90,
15-91,15-96,15-97,15CL,223,227,237,
239,3001,3002,3003,3004,3005,3011,
3012,3013,3014,4001,4005,4006,4009,
4011,4012,4015,4016,4019,4022,5102,
5107,5123,5127,5502,5504,5505,5508,
5522,5524,5525,5528

Also fits for Most Kenmore® and White® models.