Pack of 20 Brand New Large Capacity Bobbins For PFAFF Industrial Sewing Machines. The bobbin compatible part number #18339. The Metric measurements for this bobbin is 25.5MM Wide and 11MM Thick. This bobbin is used on many models of PFAFF Industrial Sewing Machines including Walking Foot machines with large capacity hook. These high quality bobbins will fit following PFAFF models : 541, 542, 543, 544, 545, 546, 551, 552, 553, 554, 555, 591, 592, 593, 594, 595, 596, 720, 748, 1240, 1241, 1242, 1243, 1244, 1245, 1246 This bobbin will also fit following make/models of Industrial Sewing Machines : ALDER : 167 Class DIAMOND : TB-545, TB-546, TB-1245, TB-1246 JUKI : LS-341 MILLION SPECIAL : MS-1245 TAKING : TK-545, TK-546, TK-1245, TK-1246 WOEI RONG : WR-810, WR-820 And many more ! Bobbin color may vary. We stock many different types bobbins & bobbin cases for sewing machines. Even if you don't find the one you are looking for, it does not mean we don't have it in stock. Please let us know machine builders' reference numbers and/or machine make & model and we will find one for you.