In the event that the trailer were to come disconnected from the vehicle, the safety chain prevent a runaway trailer The safety chain(s) that connect your trailer to your vehicle need to have a combined minimum breaking strength equal to or greater than the weight of the fully loaded trailer The chains are electro galvanized to resist corrosion These chains are 48" 54" 60" long with two 3/8" s-hooks It is 3/16" chain with a minimum breaking strength of 2,000lbs