Lower Looper For Brother Portable Sergers. Part # : X77774001 (X77774-001) High quality replacement parts. Fits Brother serger models : 925D, 929D, 935D, 1034D, 1034DAV, 1134D, 1134DW, 2034D, 3034D, 4234D, 4234DT, 5234RPW, DZ1234, PL1500, PL2000 Fits Husqvarna Viking models : 660CD, 680CD