This shallow depth 0.5 mild steel weld fitting (bung) plug kit for Innovate Motorsports wideband O2 sensors is an alternative to the 1 mild steel version included as standard with Innovate Motorsports products. Choose this option for installations that require increased sensor heat and exposure to exhaust gasses or that could benefit from a bit of extra clearance between the sensor and nearby components such as floorboards or drivetrain components.