Add to Wishlist OTC 6500 Flexihead O2 Sensor Wrench OTC 6500 Flexihead O2 Sensor Wrench Flexible head design assists in the removal of stubborn O2 sensors that are 7/8'' in diameter, a common size to most vehicles. Features: Allow extensions or wrenches to apply force in tight areas, even on seized... MSRP: $77.00