Genuine Babylock Serger Upper Looper Fits Models: BL3200, BL3-318, BL3-406, BL3-407, BL3-408, BL3-416, BL3-417, BL3-418, BL3-426, BL5180, BL5180NS, BL5260, BL5260D, BL5280ED, BL5280ENS, BL-3200, BL4-426, BL-SE200N, Simplicity SL600, SL660, SL700, SL800 SL850.  This is a genuine Baby Lock part not generic.

407-6101-01G