Our company has set up a quality inspection center with metallographic analyzer, concentricity detector, hardness tester, universal testing machine, torsion machine, coating thickness tester, salt spray tester, light screening instrument, thread detector and other testing equipment. This kind of testing equipment strictly implements the complete quality management process of first inspection, selfinspection, patrol inspection, final inspection and SGS random inspection. Especially, before packaging, each of our products will be fully inspected the appearance, the size, and the thread, to ensure that each product delivered to the customer is qualified.