Welcome to our store! 1、Accessories: Assist and replace old sewing machine accessories to ease your sewing work. 2、Material: High quality materials can be used for a long time, making your sewing work easier. 3、Applicability: Suitable for Singer, for butterfly heavy machine sewing machine. 4、Tools: Practical tools can effectively avoid jamming the spool during machine operation. 5、Practical: The spool caps is a part connected to the spool pin, which can hold the thread in place and help the thread to unfold correctly instead of jumping during sewing.Item Type: SpoolCapsMaterial: PlasticSpecification: 1 Set (1 Cover, 1 Stopper As a Set)Applies To: for SingerforButterfly Heavy Machine Sewing Machine Thread PlugProduct Function: Replace Old Sewing Machine Accessories 1 Set SpoolCaps