Features: 1.Durable Material: This thread tension assembly adopt premium metal and plastic material with simple structure, which is strong and reliable. 2.Widely Compatible: This thread tension regulator is compatible with most sewing machine model, suitable for Singer, for 1247, 1263, 1280, 1288, 1802, 1803, 1812, 1852, 1862, 1872, 1873, 237, 240, 241, 2424242430 247, 24747AP, 248, 250, 251, 252, 257, 258, 259, 288, 300, 3101, 3102, 3103, 3105, 3140, 337, 347, 360, 40, 40, 401, 401, 401, 401, 401, 401, 401, 41A, 401A, 4A, 401, 4A, 401, 401, 401, 4A, 401, 401, 401, 403, 404, 4522, 4525, 4528, 4530, 4538, 4825, 4828, 4830, 5000. 3.Smoothing Finish: This 974 thread tension features smoothing finish without scratches, effectively and greatly improving your working efficiency. 4.Wide Application: This thread tension assembly can be properly applied to create many professional sewing processes and save a lot of time. 5.Easy Installation: This sewing machine thread tension can be easily installed and operated, no complicated steps are required, saving your time and effort.specification:Item Type: Sewing Thread Tension Material: Plastic, Iron Quantity: One Piece Product Use: Replacement for Household Sewing Machine Parts Scope of Application: Most Household Multi Purpose Sewing Machines Product Size: Approx. 6cm / 2.36in ( Manual Measurement, Slight Error May Exist ) Application: Suitable for Singer, for 1247, 1263, 1280, 1288, 1802, 1803, 1812, 1852, 1862, 1872, 1873, 237, 240, 241, 2424242430 247, 24747AP, 248, 250, 251, 252, 257, 258, 259, 288, 300, 3101, 3102, 3103, 3105, 3140, 337, 347, 360, 40, 40, 401, 401, 401, 401, 401, 401, 401, 41A, 401A, 4A, 401, 4A, 401, 401, 401, 4A, 401, 401, 401, 403, 404, 4522, 4525, 4528, 4530, 4538, 4825, 4828, 4830, 5000,509, 513, 522, 527, 533, 543, 600, 6021, 6031, etc.PackageList:1 x SewingThreadTension