LATHE CHUCK KEY FEMALE INNER SIZE IS  6mm SQUARE

OUTER  DIAMETER SIZE  IS 11.3 to 12,13  APPOXIMATELY  

YOU ARE BUYING JUST THE KEY 

THIS KEY ONLY FITS  6 " INDEPENDENT CHUCK

THE SAME AS THE ONE IN PICTURES   

IF YOU REQUIRE ANY OTHER INFO PLEASE ASK

PLEASE SEE PHOTOS 

Due to manufacturing technology there may be some minor tolerances within the measured sizes.

 Please measure your chucks to ensure it will fit prior to purchase thank you