1、Metal: These thread tension assembly adopt premium metal material, which is strong and reliable. 2、Glossy Surface: These M700 thread tension feature glossy surface without scratches, greatly improving your efficiency. 3、4 Pieces: 4 pieces of overlock sewing machine thread tension assembly are packed together, meeting your needs. 4、Long Service Life: These sewing machine thread tension can be used for a long time, practical and durable. 5、Time Saving: These thread tension assembly help you create many professional sewing processes and save a lot of time. 4 x Thread Tension Assembly Item Type: Thread Tension AssemblyMaterial: MetalProduct Specifications: 4 PiecesProduct Application: Household UseApplication Scope: Most ScenariosProduct Size: Approx. 4cm / 1.57in ( Manual Measurement, Slight Error May Exist )