3" - 76mm Chuck.

 Set of Hard Jaws for 76mm / 3"  Pratt Burnerd Scroll Chuck.
 
  For Standard / Griptru Style Chuck.  (Pre Metric)
 Original set with matching serial numbers.
 Used but in excellent condition.
 
  IMPORTANT - Please check dimensions in pic #2, attention to G measurement to check these are correct for your chuck.  Thanks.