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The down the hole drill rig consists of a drill rod, a dth button bits and an impactor. when drilling, use two drill rod extensions to drill. rotary air supply mechanism consists of a rotary motor, a rotary reducer, and an air supply gyrator. slewing reducer is a three-stage cylindrical gear enclosed heterosexual component.

Sep 12, 2019 · the craftsman cobalt drill bit set is an indexed drill bit set made from a combination of solid cobalt and steel. the bits have a durable structure that’s suitable for heavy-duty use and drilling...

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