Mining Tools
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The DTH is the abbreviation of Down The Hole and sometimes it is also called RAB in some markets, then the RAB is short for Rotary Air Blasting
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
With the top quality of alloy steels imported from USA and the best carbides made in China, we produce all threaded button bits by hot press technology.
Both semi-bridge and full-bridge coupling sleeves are manufactured by Tianjin Grand.
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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