Suitable for oxygen & vacuum sensors found on most modern vehicles. Cut-outs and slots enable sockets to be fitted over wiring harness. Includes two thread chasers for cleaning and repairing damaged threads. Sockets: Heated Oxygen Sensor Socket 1/2" DR. x 7/8" (22mm) x 50mm long. Vacuum Switch Socket 3/8" DR. x 7/8" (22mm) x 31mm long. Vacuum Switch Socket 3/8" DR. x 7/8" (22mm) x 6PT x 80mm long. Thread Chasers: M12 x 1.25mm & M18 x 1.5mm. Tapered 12mm and 18mm threads designed to start and remove carbon & dirt or straighten damaged threads in spark plug hole. Use with deep socket open ends or boxes wrench.