About Seller: We utilize the highest quality AISI 4140 Aircraft Grade Chrome-Moly available in our products. Each piece of 4140 material undergoes metallurgical analysis and certification. Our hoist rings are heat treated to MIL-H-6875 standards and undergo 100% magnetic particle inspection in accordance with ASME Section 5, Article 7. Certification and lot tracking data are meticulously maintained and can be accessed for review at any time. Our hoist rings are regularly load tested by an independent testing laboratory, with test reports available upon request. We are proud to be approved suppliers of hoist rings to esteemed companies such as General Motors, Chrysler, Ford, Boeing, General Electric, Westinghouse, Lockheed, as well as numerous public utilities including nuclear power generating facilities.