BROTHER 1034D SERGER UPPER KNIFE XB01687001
For use with Brother: 355D, 734D, 734DS, 1034D, 1034DAV, 1034DX, 1134D, 1134DW, 1334D, 1334DE, 1534D, 1634D, 2034D, 3034D, 3100DL, 4100D, 4234D, 4234DT, 5100D, 5234PRW, DZ1234, M343D, ST4031HD**, and others.
Check your manual for part number(s): XB1687001 OR XB0563001