Arlington D-23 3" D Ring For Cable Management. Box of 10. The Arlington D-33 D-Ring is made of durable non conductive plastic with a smooth surface that will not damage your and offers very nice fit and finish compared to to cast metal d rings. There are four mounting holes that will hold up to #10 screw, a standard #6 drywall screw will do the job and blend in nice. Offers a nice clean look to your closets.