Products
Grand DTH bits are made of superior quality alloy steel which is made by Timken in U.S. Besides, all our DTH bits are using the brand "Element Six" T.C carbide which provides (the T.C buttons) for Boart Longyear
Look no further than Grand's Threaded Button Bits. We bring you top-quality alloy steels from the USA and the finest carbides made in China, combined using hot press technology to produce threaded button bits that excel in various drilling scenarios.
Both semi-bridge and full-bridge coupling sleeves are manufactured by Tianjin Grand.
Reaming drilling tools are used when a large diameter is needed to be reamed out after a pilot holes is drilled to a depth
Grand Rotary Grand Bits have optimally designed bearing structures and carbide inserts to withstand extreme challenge of today's mining applications.
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