The advanced 8-thread Evolution serger brings you the latest evolution in threading technology with ExtraordinAir threading. With just one push of a button, ExtraordinAir takes your thread through all three loopers at once, instantly, with a gust of air. Plus, you can thread the Evolution in any order. Eliminate tensions and puckering with the patented Automatic Thread Delivery System. Combine chain and overlock stitches to form up to 8-thread stitches.