Plunger of gages expand from center, under spring tension, to size of hole being measured and is then locked in place by knurled knob. Measurement is made by a micrometer or a caliper.
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Fowler High Precision
Fowler High Precision
Fowler High Precision
Fowler High Precision
Fowler High Precision
Fowler High Precision
Fowler High Precision
Fowler High Precision
Fowler High Precision