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The Heininger Advantage SportsRack Trailer Hitch Lock is great for securing your bike rack or trailer to the hitch. It has a 0.625" diameter and fits 2" x 2" trailer hitches (Class III and Class IV). Its inside width is 2.625" and has an overall length of 6". The weather-resistant lock features a covered key opening for added durability. It also comes with two keys for your safety and convenience.
Pin Diameter 5/8", Inside width 2-5/8", overall length 6" (Class III and Class IV)