Title: Changsha Changtan Machinery Co., Ltd. Description: is one of professional manufacturers and leading exporters of Premium-quality drilling rigs, mud pumps, diamond core bits, reaming shells, drill rods, wireline core barrels and other drilling tools in China. All sites are ISO9001 Quality Certified. Tags: drilling rigs mud pumps core bits drill rods Category: Tools and Equipment URL: http://www.changtandrill.com