Rank: Advanced Member
Groups: Registered
Joined: 8/27/2020(UTC)
Posts: 33
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Double Tube Drill Bit T2 series is thin-wall Double pipe drilling tool，Used for surface drilling, especially for prospecting。Because of their thin walls, these tools provide fast drilling speed。 https://www.speedmadedrill.com/d...uble-tube-drill-bit.html
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