Features: 1Feature a barbell design and come with a 5/8in diameter pin to fit class III/IV 2in x 2in and class V 2?1/2in x 2?1/2in receivers. 2Help lock into your trailer and keeps it secure, and work to prevent the theft of your towing hitch. Include two keys for added convenience. 3The upgraded aluminum alloy plum blossom lock core adopts more advanced anti?theft technology for higher security. 4With 1/4?turn lock activation, make it easy to lock and unlock without the need to do any modification such as drill or mount. 5Watertight dust cap well protect the keyhole, prevent water and dirt from entering while keeping the inner lock rust?free. 6Made of heavy duty iron for superior strength, with a black finish to increase the wear resistance and rust resistance. 7Heavy duty hitch lock works for RV and trailer, securely and reliably attach your tow ball mount to your tow bar. Item Type: Trailer Lock Material: Iron Diameter: 5/8in/1.6cm Fitment: Universal for trailers and RVs This wonderful locking hitch pin just solve your problem such as make sure your things are secure and locked up, or find a great way to deter anyone from removing the bike carrier from the hitch. Hitch locks allow you to lock your ball mount into your trailer hitch, deterring theft and preventing anyone from detaching your trailer at the ball mount. Smooth barbell locking mechanism with with a watertight dust cap to keep out the elements and prevent corrosion. It is easy to install, no drilling required. With a simple 1/4-turn lock key, provide security at both the vehicle-side and trailer-side. Finally You own peace of mind knowing your property is safely connected to your vehicle and free from any theft. How to Use: Plug and play 1 x Trailer Lock 2 x Key