Product Size: This O2 Sensor Socket Has A Standard 6-Point Shape And The Socket Size Is 7/8 Inch (22mm) Which Fits Most Oxygen Sensors. The Square Hole Size Is 1/2 Inch (13mm), Suitable For 1/2" Drive Ratchet Or Breaker Bar Product Use: The O2 Sensor Remover Is Suitable For Most Cars’ Oxygen Sensor, You Can Use It To Disassemble, Replace And Clean The Car Oxygen Sensor To Help Reduce Your Car's Emissions And Fuel Consumption Cutout Design: The O2 Oxygen Sensor Removal Tool Is Designed With A 0.7” (18mm) Side Wire Gate Which Is Extra Wide Enough To Pass Through The Wire To Prevent Damage To Wires, This Design Allows You To Remove The Oxygen Sensor While Still Connecting The Wire Harness, Which Is Both Convenient And Safe Product Material: The Oxygen Sensor Socket Is Made Of High-Quality Chrome Vanadium Steel, And Heat Treatment To Improve Material Performance And Make It More Durable Anti-Slip Slotts: The Square Hole Of This Socket Has A Unique Slotted Design. The Four Small Slots Have A Good Anti-Slip Effect, Which Can Help To Hold The Ratchet Firmly, Making You More Secure When Using The Oxygen Sensor Tool