Upper Knife, Bernette, Bernina, Juki #50143403

Compatible with Bernina - Bernette Serger Models: 800, Funlock 003, 004, 003D, 004D, 006D, 007D, 008D, 009D, 700D, 800D, 800DL, 1100D, 1200DA, 1300DC, MO-334, MO-334D, MO-335, 2000DE, 2500DCE, MO-613, MO-634, MO-634D, MO-634DE, MO-664, MO-664D, MO-654DE, 655, 655DE.  Compatible with Juki Serger Machine Models:MO-623,MO-634, MO-613, MO-634DE, MO-644D, MO-654DE, MO-655, MO-655DE & MO-735 Alternative Part Numbers Include A4142-335-000 (A4142335000)