The Andersen Hitches Ultimate Connection Safety Chains include a specially designed set of Rail Tabs to simplify the installation. The Rail Tabs should be installed into the extra tab positions on your industry-standard rail that is located closer to your tailgate. The safety chains can be connected to the Rail Tabs using either the chain hooks or the threaded chain link included in the kit. Rating: 18, 000 lbs. per chain (grade 70)NOTE: The extended bolts and threaded eyelets in this kit replace the kingpin coupler bolts that ship with the Ultimate 5th Wheel Connection (Rail version). Connect with either chain hooks or the threaded chain link included in the kit Rated 18, 000 lbs. per chain (grade 70) | Hitches Ultimate Connection Safety Chains with Rail Tabs