Threaders Overlocking Thread – Black Get the best results from your overlocking with our 100% polyester overlocking thread from Threaders! Overlock is a kind of stitch that is used for edging, hemming or seaming needlecraft projects. It is usually done with an overlocking machine, like our Gemini Lock Pro, as this cuts the edges whilst stitching the edge. Black is a colour that goes with absolutely everything, so this overlocking thread from Threaders is the perfect addition to your collection. It can be used with a machine or for hand sewing, making it a great multi-purpose product. With 5000m of thread, you’ll have plenty to complete all of your projects!