The core bit includes shank and thread, which consists of male thread and female thread.

有直柄钻头和螺纹柄钻头之分，螺纹柄分为内螺纹和外螺纹。

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Adopting the new method to female thread machining, high hardness of thread can be acquired, and tap broken cases reduce significantly.

采用振动挤压攻丝新方法对钛合金材料进行内螺纹加工，螺纹表面硬度高，丝锥损坏现象显著减小。

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The lighting device comprises at least a metal sleeve with a female thread, a printed circuit board, a LED, a microswitch, a spring electrode, a battery and a rear metal cover.

照明装置至少包括带内螺纹的金属衬套、印刷电路板、发光二极管、微动开关、弹簧电极、电池及金属后盖。

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Alternatively for more unusual, unbranded souvenirs, visit the Women's Handicraft Centre (Karama St, Al Mushrif), where local female artisans produce weaving and thread-work, or don your haggling hat at the carpet souq on Al Meena Road.

BBC: Stopover in Abu Dhabi