General description These 4Pc Oxygen Sensor Extension Connectors are essential for optimizing your vehicle's performance, especially when using a HHO system or test pipe. They help tilt your vehicle for improved gas mileage and are designed for easy installation. Technical specifications Size: M18 x 1.5 Length: 1.253 inches Drilled diameter: 0.5175 inches Hex head size: 7/8 inch Fits most sensors with a 1/2 inch diameter tip Material: Metal Color: Silver Measurement allowed error: +/- 1-3 cm Installation Installation is straightforward: unscrew your O2 sensor from the exhaust, screw the sensor into the extender, and then screw both pieces back into the exhaust. The extension's 7/8 hex head makes it easier to install compared to straight-sided extensions. Usage These extensions can be stacked if additional space is needed, and they feature a conical seat that does not require a washer. Other information Package Contents: 4 x Sensor Extension Connectors. Note: Light reflection and