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 )Package List4 x Thread Tension AssemblyPlease note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.1Metal: These thread tension assembly adopt premium metal material, which is strong and reliable. 2Glossy Surface: These M700 thread tension feature glossy surface without scratches, greatly improving your efficiency. 34 Pieces: 4 pieces of overlock sewing machine thread tension assembly are packed together, meeting your needs. 4Long Service Life: These sewing machine thread tension can be used for a long time, practical and durable. 5Time Saving: These thread tension assembly help you create many professional sewing processes and save a lot of time.