Cast Solid Brass D Ring.  Inside measurement options from 1/2" to 2".

1.5" Black Oxide Solid Triangle Ring with hole for 1.5" webbing or strapping. Hole diameter: 0.5".

5/8" wide metal ring clip attaches to leather, canvas, and other heavyweight materials via rivet or chicago screw. Quickly and securely holds a D-ring or Rectangle ring for attaching straps,...

Screw-opening D-ring often used for paracord bracelets. Overall dimensions: 24mm including screw x 31.8 mm. Opening: 10mm wide. Screw post diameter: 4.8mm) 

1" Black Oxide Solid Triangle Ring with hole for 1" webbing or strapping. Hole diameter: 3/8".

5/8" D-ring with hinged attachment to decorative harware that attaches with foldover tabs to secure to sturdy materials. Quickly and securely holds a swivel hook or strap.