Screw-opening D-ring often used for paracord bracelets.
Dimensions:
Medium:
Outside Measurements: 1.25" x 1.25"
Inside Measurement: Widest part - 5/8", Bar - 7/16"
Large
Outside Measurements: 2" x 2"
Inside Measurement: Widest part - 1 1/8", Bar - 11/16"