Starrett: Center Gages #C391

• Extremely handy for use in grinding and setting screw cutting tools
• Meet the following standards: American National or U.S. 60°, Whitworth or English 55°, and Metric 60°.
• They also have a very useful scale for finding the number of threads per inch through graduations in 14ths, 20ths, 24ths and 32nds of an inch
• 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.
• Gaging surfaces ground.