Mettler Seracor overlock thread in White is an all-round overlock thread. It has outstanding seam elasticity, with a filigree look, sewing evenly to create flat, clean seams on all fabrics. Serecor offers exceptionally smooth, trouble-free sewing, even on the most sophisticated of multifunction overlock machines. Seracor is totally shrink proof and the snap-lock spool will lock your thread in place when not in use.