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hollow drill bit championship (opening drill bit)

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alloy drill bit the utility model is specifically referred to as a drill bit that replaces the cutter head, which is the technical field of drilling tools, including the drill pipe and the cutter head. the end of the drill pipe is provided with a cutter head fixation slot, and the cutter head fixing groove is v-type. the cutter head fixing groove. hollow drill's maintenance hollow drill's maintenance hollow drill's maintenance hollow drunk bit maintenance hollow drill hollow drunk bits the use of hollow drill bore, do not use force, slowly.

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