THIS IS A ACE TAP AND DIE SET. IT IS A 12 PIECE N.F. SET. IT IS MADE BY ACE TOOLS. ON THE FRONT OF BOX IT SAYS ACE TAP AND DIE SET - THREAD - HENRY L HANSON CO. WORCESTER, MASS U.S.A.INSIDE IT HAS A TAP AND DRILL SIZE CHART . I HAVE NO IDEA HOW OLD THIS SET IS. THE BOX IS MADE OF WOOD WITH REDISH/ORANGE COLOR. THE DIES ARE MARKED 1-4-20NC, 10-24NC, 12-24NC,8-32NC 6-32NC. I SEE NO SIZES ON TAPS. THEY SEEM TO HAVE A BRUSH TYPE END. I DONOT KNOW MUCH ABOUT THIS SET OR HOW OLD IT IS. SEE PICTURE AND EMAIL WITH QUESTIONS.
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