Cutex (TM) Brand Bobbin Case for Singer 31-15, 331k Sewing Machine #62740 Bobbin Case for Singer 31-15, 331K Sewing Machine #62740 This high quality bobbin case fits following machines : For Juki DNU-1541, DNU-1541H, DNU-1541S, DNU-241H, DNU-261H Singer : 31 Class (except 31-19, 31-20), 31-15, 44-10, 44-12, 331K, 431D Adler : 37, Alfa : 157, Consew : 30