Powerbuilt 643003 3/8-Inch Drive 13/16-Inch U-Joint Spark Plug Made to be the most reliable tools in the market today Tool solutions for most all situations Built to exceed tool standards For accessing hard-to-reach plugs 6 point deep well thin wall mirror polished chrome vanadium socket with dual grease rings Rubber retaining ring holds plug securely Chamfered opening for easier mating to plug Meets or exceeds ANSI standards. Lifetime warranty