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I think you mean a drum micrometer, but I could be wrong.

A drum micrometer is really a dial or digital caliper that checks the wear

on a break drum on a car. The wear on a drum is on the inside of the drum and is checked by the ID (inside diameter) with the tool, a micrometer for the most part

checks the OD (outside diameter) of something. The most accurate way of testing

ID is with a spring loaded pin rod, then check the pin distance with a micrometer.

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16y ago

What else can I help you with?