5pc Oxygen O2 Sensor Socket Remover/Installer Thread Chaser Tool Set. 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. X 7/8 (22mm) x 6PT x 80mm long. Thread Chasers: M12 x 1.25mm & M18 x 1.5mm. Chrome Molybdenum and chrome vanadium For durability. Supplied in a handy storage case.