Use the ABN | Travel Trailer Lock Universal Coupler Lock Trailer Hitch Lock Set to secure your camper, RV, or boat trailer to deter thieves from taking off with your trailer and equipment. Each rv trailer hitch locks set includes 1 bright red aluminum alloy travel trailer hitch lock coupler unit with a 1/2 inch thick U-bolt steel lock bar. 4-inch space fits most trailer hitches included sizes from 1-7/8 inch to 2-7/8 inch ball joint hitches. Premium materials provide resistance to rust, corrosion, and weather and are rated for a load capacity of 1 Ton. RV trailer locks with keys lock and unlock only with keys provided (duplicates and alike key systems not available). WARNING: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.