THREAD CHASER SET FOR CUTTING 1/4" NPT THREADS...  THESE ARE NEW OLD SURPLUS SETS PURCHASED IN 1981 AND NEVER USED.  SETS ARE ALL SEALED.

DIE HEAD STYLE/SIZE: GEOMETRIC 9/16D DIE HEAD

THREAD SIZE/TYPE: 1/4" NPT

PLEASE CONTACT ME IF YOU HAVE ANY QUESTIONS.  THANK YOU FOR LOOKING!