Juki MO-644D 2-needle, 2/3/4 Thread Serger w/ Platinum Series Exclusive Bonus Package! JUKI MO-644D Garnet Series 2-Needle, 2/3/4 Thread Overlock with Built-In Rolled Hemming & Differential Feed. Color Coded Threading Guides throughout the machine make threading easy and efficient Adjustable Differential Feed is controlled and adjusted by a dial conveniently located on the outside, left-hand side of the machine 2/3 Thread Converter is easy to install and allows 1 needle thread and one lower looper thread for securing overedging Sewing Speed: Max 1,500 spm