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HEBEI HOLLYLAND CO., LTD, established in 1984, is one of the leading manufacturer of DIAMOND DRILLING TOOLS in China, also a high-tech enterprise specialized in researching, manufacturing and marketing of 1) DIAMOND CORE DRILL BITS for concrete, asphalt, ceramics, bricks, refractory material, stones, construction and abrasive materials etc; 2) DIAMOND DRILL BITS and REAMING SHELLS, PDC BITS for geological prospecting, mining exploration, hydrogeological exploration and oil, gas exploration etc; 3) DTH HAMME...
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