DTH Drill Bit
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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.
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