PRACTICAL: The bobbin can be used on most sewing and embroidery spools (except large commercial or oversized spools), which saves time looking for small notches in the bobbin for threading. PROS: When you use these spool clamps, they protect the spool from falling off, and at the same time make it easy to distinguish the color of the spool. EXCELLENT MATERIAL: The threaded control frame is made of high quality plastic, which has good durability and expandability, durable and long APPLICATION: The spool clamp is suitable for your various uses, suitable for most spools and spools, and a variety of colors will meet your different needs, making your sewing work no longer messy. AFTER-SALES SERVICE: Our spool clamps are brand new, if you have any questions about our products, you can contact us at any time, we will provide you with sincere service.