Maxi-Lock® is used by major serger manufacturers to test their machines and to demonstrate them in retail settings before each sale.  That's how highly they regard Maxi-Lock. Where their thread truly distinguishes itself, though, is in the home.  Its soft finish disguises a strength that holds up under the most vigorous seamwork.  Its consistency, beginning to end, makes it easy to set and maintain tensions, which is a major product advantage.  3000 Yard Spool.