Spool caps help your thread to stay on the spool pin of your machine and provide a smooth surface for the thread to glide over. This smooth feed allows for more consistent stitches. Benefits of a Spool Cap Designed to keep the thread spool on the sewing machine spool pin as you sew Smooth edge prevents the thread from being snagged Holds the thread spool in the proper place so that the thread can evenly feed off the spool Made of durable shatter-resistant plastic. Cap measures approximately 1-3/4" wide with the center hole measuring .22" wide. Guaranteed to fit Bernette Sewing Machine Models:65, 80E, 90E, Sew&Go 1, Sew&Go 3, Sew&Go 5 Guaranteed to fit Europro Sewing Machine Models:9110, 9105, 9125Guaranteed to fit EverSewn Sewing Machine Models:Charlotte, Maker 100 Guaranteed to fit Husqvarna Viking Sewing Machine Models:Huskystar C10, Huskystar C20, Huskystar E-10 Guaranteed to fit Juki Sewing Machine Models:HZL-355ZW-A, HZL-355ZW-C, HZL-70HW Guaranteed to fit Pfaff Sewing Machine Models:100S, 200C SmartGuaranteed to fit Singer Sewing Machine Models:1105, 1116, 1120, 1130, 1507, 1525, 1725, 1748, 2009, 2010 Professional, 2010 Superb, 2250, 2259, 2263, 2273, 2277 Tradition, 2282, 2932, 3116 Simple, 3221 Simple, 3223, 3229, 3232 Simple, 3321, 3323, 3337, 3342 Fashion Mate, 3709, 3709-1, 3722, 3722-1, 3750, 3810, 3810-1, 3820, 3820-1, 3825, 3825-1, 3860, 44S, 4411, 4423, 4432, 4452, 5511, 5523, 5532 Heavy Duty, 5554, 6510, 6550, 7312, 7322, 7350, 7360, 7380, 7640, 8260L, 8275, 8280, 8770, 9100, 9340, 992DE, ET-1, H74, HD6380, HD6380M, HD660, HD6600, HD6605, HD6800C, M3220Alternate Part Numbers: 38003700, 416500701, 4161571-01, 68003700, R12373209, R12373210, 40165252, 5020205926