Bernina L660 Air Thread Overlocker One-Step Air Threader, Free-Hand System with Feed Dogs, Programable Needle Stop

Precision in every detail Micro Thread Control (mtc) Differential feed Total stitch control With Micro Thread Control (MTC), you can fine-tune the looper thread amount for a flawless fabric edge. Just like any other setting, you can adjust the looper thread amount at any moment to achieve perfect stitches every time, even while you’re sewing. The stepless differential feed keeps even delicate or highly elastic fabrics beautifully smooth and free from puckering. It is this Total Stitch Control by BERNINA that gives you the freedom to create unique effects.