UNIQUE CREATIV TRULOCK serging thread is a 40 wt thread for overlock machines and sergers. The 1500 m (1640 yd) cone gives ample thread for seam finishing, edge stitching and longer sewing runs, while the 100% polyester construction is suited to everyday garment, craft and home décor sewing. Use it for clean serged seams, rolled hems and narrow overedge stitching where a cone feed is preferred on compatible machines.