Hemline Thread Nets 5pcs Hemline Thread Nets 5pcs Anti-Tangled Elasticized nets which fit snuggly over thread cones to prevent thread from falling down and tangling. Also helps to maintain thread for the machine. Features: Use with overlocking/serger thread tension of 1000, 2000, 3000 and 5000 metres. Helps keep a consistent thread tension and stops thread from tangling and falling down. Tips: Slide a net over the cone and bring the thread end up through the top of the net.