Safety Engineered Hoist Rings retain the same rated load from 0 to 90° from the bolt axis. 360° swivel and 180° pivot under load. Design Factor: 5:1. The Alloy steel version have a minimum tensile strength of 180,000 psi, are magnetic particle inspected per ASTM 1444 & have a black oxide finish which aids corrosion resistance. The Stainless Steel 300 versions are NDT: 100% liquid penetrant tested per MIL-STD-50032, ASTME 1417, purification process: clean and passivate per ASTM A 967, QQ-P-35 Type II. To meet maximum load capacities, high strength screws must be used. Never exceed maximum load rating.