Features: Stainless steel material. Internal and external thread M18 x 1.5. Hexagonal outer contour. Exhaust gas inlet hole 3 mm. In extreme situations, narrowing of the inlet hole helps prevent motor failure during high-speed driving. Polished front surfaces enable secure tightening. Threads precision-made with dedicated tooling for accurate fit and consistent performance. Manufactured by a professional producer for reliable quality. Simple installation process: remove the original lambda oxygen sensor, install the emulator in its place, then reinstall the oxygen sensor. Specifications: Condition: High quality. Color: Silver. Size: Refer to product images. Material: Stainless Steel. Package includes: 1 x Oxygen Sensor Emulator. Notes: Clear images and measurements are provided whenever possible. Please review all details carefully to ensure the item meets your requirements. Allow 0.5–1 inch variation due to manual measurement (1 inch = 2.54 cm). Actual item color may vary slightly from images due to differences in screen displays. Installation instructions are not included. Professional installation is highly recommended.