The Cal-Van Tools 12 and 6 Point Flexible Oxygen Sensor Wrench, No. 844, is designed for use with most oxygen sensors. This tool has a double-sided design that allows technicians easier access with the 12 point socket and more torque with the 6 point socket for rusted or stubborn sensors. This wrench allows techs to remove sensors in difficult areas. The offset design allows more room and leverage in confined areas.