Maxi-Lockå¨ 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 our 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 Maxi-Lockå¨ meets the demands of serger sewing like no other thread, withstanding the high speeds and tensions that are unique to serging. That's why Maxi-Lock is the best-selling serger thread!~