Starrett 60 American National Standard Center Gage C391 – 10-841-5

• Extremely handy for use in grinding and setting screw cutting tools.
• Meets American National or U.S. 60, Whitworth or English 55 and Mertic 60 standards.
• Very useful for finding number of threads per inch through graduations in 14ths, 20ths, 24ths and 32nds of an inch on (C391) and (C396).
• Graduations on (C938M) are in mm and 12 mm.
• 10-841-5 gage also has a table of double depths of threads for determining size of tap drills.
• Made of spring-tempered steel with satin chrome finish.
• Ground gaging surfaces.

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