7/8- 22mm Slotted O2 Socket Size – 7/8” (22mm) hex socket fits all popular oxygen sensors. 3/8” square drive ratchet. Design – Standard 6 point slotted socket design enables removal of oxygen sensor while leaving wiring harness attached to vehicle. Material – Made from Chrome Moly for strength and durability and finished in black oxide coating to prevent rust. Use – For use with 3/8 rachet or breaker bar for easy removal and installation of oxygen sensor on all popular vehicles. This tool saves time and gets into tight spaces that a wrench can’t. Included – One 02 socket, one 8” GGB decal, four 5” GGB decals. Service – 100% satisfaction guarantee. If you have any issues with the oxygen sensor socket, contact us for trouble shooting solutions, general help, replacement, refund. Your satisfaction is our top priority.