Round shank DCx1=81x1 Babylock/Simplicity Serger Needles ASSORTED SIZE (DEFAULT #10 12 14 16 18 20) OR EMAIL US WHAT SIZE YOU LIKE DCx1 Overlock / Serger needle Fits: Babylock/Simplicity BL3-406, BL3-416,BL3-407, BLE-417,BL3-408,BL-3200, BL3-418,SL600,SL700,SL800; Riccarlock RL330, RL333; PFAFF Hobbylock HL-603A