['Spring-loaded plunger expands within the bore (or groove), allowing determination of the internal diameter (or groove width)', 'With a knurled clamp', 'Spring loaded plunger', 'Used for comparative measurement of bore diameter and groove width.']
Spring loaded plunger
Used for comparative measurement of bore diameter and groove width.
Spring-loaded plunger expands within the bore (or groove), allowing determination of the internal diameter (or groove width)