Here is one used (1) C391 Starrett center gage, American Unified National Standard. It is 60 degrees on all angles. Very useful for findinf number of treads per inch through graduations in 14ths, 20ths, 24ths, and 32nds of an inch.
Document Title: Sunnen GR & GRM Dial Bore Gage Parts Manual Number Of Pages: 4 Condition Of Original: Very Good Scan Type: Black & White and Augmented Grayscale conversion of Contents Scan Quality: Very Good Description: This manual covers repair parts for the Sunnen GR & GRM Model Dial Bore Gages. And exploded view of the gage unit is followed by pages of parts indexes and description. Very straightforward reference!
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