643003 3/8" Dr. 13/16" U-Joint Spark Plug Socket

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. Center hole punched for added work depth. Chamfered opening for easier mating to plug. Meets or exceeds ANSI standards. Lifetime Warranty.