Replacing an oxygen sensor is no fun. The trick is in accessing the sensor and being able to extract a strongly welded piece of metal. The ABN Oxygen 02 Sensor Socket 7-Piece Tool Kit – 22mm (7/8” Inches), 27mm, 29mm – All Vehicle O2 Removal and Installation makes the task simple and gives you peace of mind knowing the job is done right. The beveled nose design securely grips oxygen sensor fasteners to prevent damage to the sensor. The side cutout prevents damage to wires and provides clearance for a wire harness so the wires do not get in the way when you’re working. The size is permanently etched on the chrome-vanadium steel exterior of each socket wall, and it all comes packed inside a carrying case for your convenience. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.