Pack of 10 Steel Bobbins For Industrial Sewing Machines. Juki part # B9117-201-000, #400-21610 For Juki models : DNU-1541, DNU-241, DNU-261, DSC-246, DSU-144, DU-141, DU-1181, DU-580, LS-341, LS-1340, LS-1342 and more. These high quality bobbins will also fit sewing machines using "M" size bobbins which measures 1" diameter and 3/8" height.