We have been also specializing in improving the things administration and QC system to ensure that we could preserve terrific gain within the fiercely-competitive company for oilfield drilling bit iadc237, TCI water well bit factory, carbide drill bit IADC537, roller cones for hole opener,GG25 CHECK VALVE. To better expand market, we sincerely invite ambitious individuals and companies to join as an agent. The product will supply to all over the world, such as Europe, America, Australia,Japan, Portugal,Angola, Paraguay.We set a strict quality control system. We have return and exchange policy, and you can exchange within 7 days after receive the wigs if it is in new station and we service repairing free for our products. Please feel free to contact us for further information if you have any questions. We are glad to work for every client.