Workshop Technology
The instrument used to measure external and internal diameter of shafts, thickness of parts and depth of holes, is

Depth gauge micrometer
Inside micrometer
Outside micrometer
Vernier caliper

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Workshop Technology
Piercing is an operation of cutting

A number of holes evenly spaced in a regular pattern on a sheet of metal
A hole (other than cylindrical) in a sheet of metal by the punch and the die
A flat sheet to the desired shape
A cylindrical hole in a sheet of metal by the punch and the die

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