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Stc391 Starrett Center Gages

***Shown with Optional Attachment***
Am. Nat. — U.S. 60° Std. has scale graduated in 14ths, 20ths, 24ths and 32nds for finding number of threads per inch. Table of double depths of threads for determining size of tap drills. All gaging surfaces ground. Gunsmith, Made in the USA.