Create professional seams with the ease of the 644D.  This overlocker has a colour coded threading guide and built in lower looper threader.  Converting from standard to roll hem is hassle free, no longer having to change needle plates and feet. 
The differential feed helps with fabric distortion stopping woven fabric from puckering and knits from stretching while they are being stitched
 
Machine features
2,3 and 4 thread seams
Tension release with foot lifter
Adjustable stitch length
Differential feed
Adjustable cutting width
Waste tray
Instructional DVD