Changsha Changtan Machinery Co., Ltd is one of professional manufacturers and leading exporters of Premium-quality drilling rigs and drilling tools in China. All sites are ISO9001: 2000 Certified. We are quite sure that our products will meet the requirement of yours. Please find our products line as follows: 1. Drilling Rigs for hole depth from 30m to 1600m; 2. Mud Pumps; 3. diamond core bits (Impregnated and surface set diamond core bits), reaming shells, drill rods and core barrels in DCDMA, CDDA, Craelius, and ISO standards; 4. DTH hammers, similar or equal DHD, COP and SD series hammers; 5. DTH bits, similar or equal DHD, COP and SD series bits; 6. Threaded bits & tapered bits, diameter from 33mm to 127mm; 7. Other drilling accessories, such as drill rods, core barrel, casing pipes, etc; 8. Laboratory facilities for mining. If you are interested, pls email to: impexp at changtandrill dot com We will feel happy to give you a quotation upon receipt of your details.