钻头规是种周长一定的环型物，它卡紧在钻头的周围，去检测和测量钻头是否磨损，即在钻井过程中是否减少了周长。

Bit gauges, rings of defined circumference, are slipped around drill bits to detect and measure wear, which reduces the circumference of the bit during drilling.

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护环是发电机的重要设备，用来卡紧线圈端部，克服离心力的影响。

The retaining ring is a main equipment of the power generator, it is used to tighten the end of the loop, and overcome the influence of the centrifugal force.

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