Professional API thread gauge of manufacturing enterprises in China, producing all kinds of ordinary gauge, thread amount on buckle OCTG gauge and a variety of special rules of professional manufacturers. The full range of product specifications, widely used in oil and gas, geological exploration and other industries.The company has passed the API certification of American Petroleum Institute (API SPEC 7-2-0680, the API SPEC5B-0032), passed the quality certification of ISO 9001:2008-UQ090985R0.