Product Description The OEMTOOLS 27110 Oxygen Sensor Socket Set is a universal slotted oxygen sensor tool kit that installs, removes, and services automotive hex vacuum switches and oxygen sensors. A standard 6 point design with a low profile and side cutout makes it possible to remove sensors safely with the wiring harness still attached. The o2 sensor tool is offset and compact, allowing extra leverage in confined spaces, and compatible with common 3/8 and 1/2 drive wrenches and ratchets. Don't wrestle with DIY fixes when you need a specialty tool. This professional grade 22 millimeter, or 7/8 inch, o2 sensor socket set is applicable for most vehicles on the road today, both imported and domestic. The OEMTOOLS 27110 Oxygen Sensor Socket Set includes a high quality custom storage case for easy identification and portability. From the Manufacturer A special purpose, universal slotted socket that will service hex vacuum switches and oxygen sensors. Comes in a molded plastic carry/storage case.