Describe ‘plug’’and ‘snap’gauges with neat sketches.

Plug gauges are precision instruments used in metrology to assess the dimensional accuracy and tolerances of holes. They consist of a cylindrical shaft with a precisely machined diameter, and they come in two main types: plain plug gauges and threaded plug gauges.

1. Plain Plug Gauges:
   - *Design:* A plain plug gauge is a cylindrical rod with a smooth, precisely machined surface. It is designed to fit into the hole being measured snugly.
   - *Application:* These gauges are employed to verify the internal dimensions of holes, ensuring that they conform to specified tolerances.
   - *Usage:* When the plain plug gauge enters the hole easily without any play, it indicates that the hole's diameter is within the acceptable tolerance range. If the gauge _______ _______ ______ __________ _____ ______.
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