Starrett No. C391 Series Center Gage

Starrett No. C391 Series Center Gage

Extremely handy for use in grinding and setting screw cutting tools, the gage meets American National or U.S. 60°. It also has a useful scale for finding the number of threads per inch through graduations in 14ths, 20ths, 24ths and 32nds of an inch. The gage also has a table of double depths of threads for determining size of tap drills.