Tianjin Grand Construction Machinery Technology Co., Ltd. deeply engaged in rock breaking tools more...
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 BlastingView More
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 LongyearView More
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.View More