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About product and suppliers:
        Alibaba.com offers 8,748 core hard rock products. About 23% of these are drill bit, 18% are mine drilling rig, and 16% are mining machinery parts. A wide variety of core hard rock options are available to you, such as carbide, carbon steel, and high manganese steel. You can also choose from drill bit, drill collar, and drill pipe. As well as from drilling tool, drilling equipment, and crusher. And whether core hard rock is api, aisi, or din. There are 8,756 core hard rock suppliers, mainly located in Asia. The top supplying countries are China (Mainland), India, and Algeria, which supply 99%, 1%, and 1% of core hard rock respectively. Core hard rock products are most popular in Mid East, North America, and Domestic Market. You can ensure product safety by selecting from certified suppliers, including 4,444 with Other, 3,409 with ISO9001, and 401 with ISO14001 certification.
        
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