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。
The separate flushing(air) system can be connected with shank adaptors by internal or external rope thread or trapezoidal thread . The customers can order according to their own requirements.
旁侧供水（风）系统钎尾有内外波形、梯形螺纹连接，用户可根据需要单独订货。
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