Maximum load: Made with high-grade steel, the stake pocket D ring has a breaking limit of 18,000 lbs and a working load limit of 5,400 lbs. Comes with a bolt and hitch combo that attaches to your truck or trailer stack pocket. The D Ring promises strength and durability that stands up to the test of time and rigorous use. Multifunctional: This stake D-ring has 4 open pin holes for precise pin placement to ensure a perfect fit with the pile bag. It is compatible with standard size general purpose pile bag. The D ring is compatible with standard size universal stake bags for most utility trailers and trucks.