We carry d-rings in multiple sizes and capacities to suit your needs. We have small light-duty d-rings (down to 1/4") that are great for use in small utility trailers. Specifically, check out the DR-025 and DR-5M. Common uses might include tying down dirt bikes, ATV's, lawn equipment, etc. But most of our users are the industrial type, which means bigger is often better. We sell the 1/2" size of d-ring most commonly, with the DR-050 Bolt-on model being our best-seller. We carry larger sizes to, up to 1" in both standard and bent styles. These large rings have a Working Load Limit of 15,600lbs! And if you need specifics, just click on any d-ring you see here. You'll have access to technical specifications along with a dimensional drawing.