Thread Knife for Home Sewing Machines. Part Number # : 4124237-01 Compatible with Husqvarna Viking models : 183 Emerald, 250C Eden Rose, 830 Sapphire, 835 Sapphire, 855 Sapphire, 870 Sapphire, 875 Sapphire, 930 Sapphire, 960Q Sapphire, Angelica, Designer 1, Designer 2, Designer Diamond, Designer Diamond Deluxe, Designer Diamond Royale, Designer Ruby, Designer Ruby deLuxe, Designer Ruby Royale, Designer SE, Designer Topaz 20, Designer Topaz 25, Designer Topaz 30, Designer Topaz 40, Designer Topaz 50, Eden Rose 250C, Huskystar C10, Huskystar C20, Quilt Designer, Performance 5.2, Platinum 955E, Platinum Plus, Quilt Designer 2, Sapphire 870, Tribute 140C, Victoria Compatible with Pfaff models : 140S, 260C, Ambition 1.0, Ambition 1.5, Ambition Essential, Expression 150, Expression 2.0, Expression 3.0, Expression 3.2 Expression 3.5, Expression 4.0, Expression 4.2, Expression 710, Creative Sensation, Creative Sensation Pro, Creative 1.5, Creative 2.0, Creative 3.0, Creative 4.0, Creative 4.5, Creative Performance, Creative Vision 5.0, Creative Vision 5.5, Passport 2.0, Performance 5.0, Quilt Ambition 2.0, Quilt Expression 4.0, Quilt Expression 720, Smarter 155 Compatible with Singer models : 1408, 1408 Prelude, 1409, Promise 1412, 183, 203, 2277, 2282, 3221, 3223, 3223GY, 3229, 3321, 3323, 3333, 3342 Fashion Mate, 4411, 4423, 44S, 5511, 5523, 5532, 5554, 8060, 85SCH, 7640 Confidence, 9100, 9340, 9960, C430, C440 Legacy, H74, HD660, HD6800C, M3220