Features: 1.Premium Material: The weld bung is made of galvanized mild carbon steel, high hardness and resistance to friction. High rust and abrasion resistance in extreme harsh condition. 2.Suitable Type: The thread size is M18 x 1.5 mm and fits most standard oxygen sensors, perfect for custom exhaust installation, headers, down pipes etc. 3.Easy Install: This nut has a notched design that makes it easy to weld flush to the surface, convenient and fast, saving your time and effort. 4.Excellent Performance: Professional manufacturing, exquisite workmanship, high accuracy, stable performance and high reliability. 5.Outstanding Features: Smooth and glossy surface, compact structure and easy to carry, resistant to deformation, practical and reliable. Specification: Item Type: Oxygen Sensor Weld Bung Material: Galvanized mild carbon steel Thread Size: M18 x 1.5mm Applicable Model: General Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.