Features: Stainless steel material.Internal and external thread M18 x 1.5.Outer contour: the hexagonal TURN-KEY 27.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, quality assurance.Simple installation. Just unscrew the lambda oxygen sensor, screw in the emulator in its place and then screw in the oxygen sensor.Specifications: Material: Steel Color: Silver Package Weight: approx. 109g Package Included: 1 x Oxygen Sensor Extender Spacer 1Polished front surfaces enabling perfect tightening 2Internal and external thread M18 x 1.5 3Threads made with dedicated tool, perfect accuracy and repeatability 4Exhaust gas inlet hole 3 mm. In extreme situations narrowing of the inlet hole prevents motor failure (driving at high speed). 5Simple installation. Just unscrew the lambda oxygen sensor, screw in the emulator in its place and then screw in the oxygen sensor.