6.0mm  LATHE CHUCK KEY FEMALE  SQUARE 
Outer Diameter Size is 11.3 to 12,13 approximately 
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