Verocious Motorsports 1010 Mild Steel O2 Sensor Bungs feature M18 x 1.5 Thread to accomodate all standard OEM and Wideband O2 Sensors. These Heat Sink Oxygen Sensor Bungs are machined with several grooves to increase the surface area of the bung, helping dissipate heat around the O2 sensor to maximize accuracy. These high quality O2 bungs can be used on everything from custom downpipes to a quick repair on an OEM exhaust system. Available as single units and in sets of 5, 25, or 100. Buy in bulk and save!