double D-ring mounting 3

https://aged-wiki.win/index.php/How_to_Prevent_Crooked_Pictures:_A_Simple_Guide_to_Hanging_Art_That_Stays_Put

The double D-ring mounting uses two interlocking metal rings to create a secure attachment point for straps or hardware. You'll often see this setup on bags or tactical gear, where it distributes weight evenly and prevents slippage. It's simple but reliable—just loop your strap through both rings and tighten. No buckles or clips to break, and the rings lie flat against the surface when not in use.