Features: Stainless steel material. Internal and external thread M18 x 1.5. Outer contour: the hexagonal Exhaust gas inlet hole 3 mm. In extreme situations narrowing of the inlet hole prevents motor failure (driving at high speed). Polished front surfaces enabling perfect tightening. Threads made with dedicated tool, perfect accuracy and repeatability. Made by professional manufacturer, assurance. Simple installation. Just unscrew the lambda oxygen sensor, screw in the emulator in its place and then screw in the oxygen sensor. Specifications: Condition: new and . Color: silver Size: check on our pictures Color:chrome Material:Stainless Steel Package included 1 x Oxygen Sensor Note 1.We provide clear pictures, measurements where possible. Please check as much as possible to make sure the item is the one that you need. 2. Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm) 3.The color of the actual items may slightly different from the listing images due to different computer screen, thanks for your understanding. 4.Instruction is not included.Professional Installation Is Highly Recommended!