Spool Pin Cap Set: This spool cap and spool set is designed for sewing machines, perfect for all kinds of domestic and industrial sewing machines, ensure the spool is firmly installed, effectively reduce thread breakage caused by loose spools during sewing Reliable Material: The bobbin tool is made of high quality plastic, which is durable and has a smooth and delicate surface, even after frequent use and long-term storage, it still maintains its good shape and performance, reducing the frequency of replacement Enhance Efficiency: The design of the bobbin cover can effectively prevent the thread from accidentally loosening or knotting during the sewing process, ensuring the smoothness of the sewing process, and the bobbin can reduce the difficulty of threading and enhance the sewing experience Easy to Use: Simply slide the bobbin cover over the bobbin pin of your sewing machine for a secure fit, no need for complicated tools, you can easily replace the bobbin cover and load the bobbin, even beginners can get started quickly, reducing the difficulty of operation Practical Tools: The size of plastic wire rod is 54x10mm, hole: 2.5mm, spool cap:44x14mm, they are not only suitable for home DIY enthusiasts, but also very suitable for professional seamstresses and garment factories, which can satisfy different needs