... four point bit 十字扁铲; 十字形钻头; 十字钻头 four-point bit 十字扁铲; 十字钻探钻头; 四刃钎头 three point bit 三刃钻头 ...
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three-point bit 三刃钻头
three point bit three-wing bit 三刃钻头
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In order to grade the used bits, IADC published the Three Point Dull bit Grading Scheme.
为了对已使用的钻头进行磨损定级，IADC制定了T - B - G钻头磨损三位定级方法。
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