High-quality swivel hooks typically comply with relevant international or national standards, such as:
Chinese Standard: GB/T 25854-2010 "D-shaped and Bow-shaped Forged Shackles for General Lifting Purposes"
European Standard: EN 1677 "Components for Lifting"
American Standard: ASME B30.10 "Safety Standard for Hooks"
Some products are also certified by CE, DNV-GL, etc., to meet specific industry or international market requirements.